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Needs more pins is why.
USB is a four pin system: ground, +5V, Data+, and Data-
If you got it the wrong way round, it could cause damage.
If you look at the pinout for USBC: USB type C Mod time![^] it's a lot more connections, and they are repeated so it doesn't matter which way up the connector is. That's a lot more expensive in terms of connector manufacturing (for both male and female halves) so the natural inclination is to go for a cheaper connector and call it "backwards compatability".
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Since when does reversing VCC and GND have any effect? A cheap and simple 7805 voltage regulator can take that. It may get close to the melting point, but it usually survives and still works afterwards.
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No need for a 7805, a diode will do that job. The point is the connection has to work whichever way its plugged in, otherwise a reversible connector is pointless.
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Oh, I know. I was referring to an incident where I was building a new power supply for an older computer and accidentally reversed +5V and GND on the main power supply on the computer. The 7805 did a great job in protecting the computer from damage. It got so hot that the solder started to melt, but it still works.
Reversible connectors are a waste if there are too many pins involved. For USB this may be prctical, but on larger connectors I always found it better to ground unneeded pins and also placed them in such a way that they were inbetween two signals that are likely to interfere with each other.
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OG nailed it earlier: it's all about cost.
Sure USB-A a has only 4 pins but making it reversible would need double that (I know could be done with less using the right components but again they cost money too).
Even though talking less than a cent for reversible USB-A, but times a few million pieces starts to eat into the CEO's bonus.
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The 7805 like all semiconductors have a voltage drop across each PN junction.
Director of Transmogrification Services
Shinobi of Query Language
Master of Yoda Conditional
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It was more of an accident that made the 7805 the only thing that stood between a computer and a reversed main power supply. It would have been quite acceptable if the 7805 had died, but protected the computer. It took me only one or two seconds to get what was happening and cut power, but in that time the 7805 got so hot that the solder started to melt.
But everything went well. The 7805 and the computer were both ok.
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You want us to spend $x million dollars/year to protect against an extremely rare manufacturing defect by a 3rd party and reduce the volume we have available to cram battery into our devices!?!!
You're fired, the money we save by not doing your crazy idea will buy a solid gold toilet for the executive wash room, not paying your salary will let us also install a solid gold door nob.
And thus when a crappy factory does mismanufacture a reversed polarity cable, it does blow up everything it gets plugged into[^].
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Starting to think people post kid pics in their profiles because that was the last time they were cute - Jeremy.
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Apple's 'lightning' connector for iPad is reversible. A nice little plastic tab with eight connectors on each side so it is easy to plug in.
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Richard MacCutchan wrote: Apple's 'lightning' connector for iPad is reversible
Well played. Apple did something right in their proprietary technology that they charge double for. 
I use Android phones but whenever I plug in my wife's iphone for her I always like the ease of it.
And I too often try to plug in micro usb the wrong way. All the time.
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I was a bit looking around on everything I would like if ever I would have any money and came across this guitar[^]
It doesn't even have 1 review! How can you buy anything so expensive without reading any reviews!
All jokes aside, not sure how you warrant this price for a guitar though... 2000 EUR, yeah sure. even 3000 - 4000 EUR, but anything above that  ?
I could not buy this guitar even if I sold my entire studio at home. 
modified 24-Jul-17 6:19am.
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Is that really the question? We all probably have a money sink, but after a certain point money does not buy you any more satisfaction with your favorite toy. If it does, then obviously showing off is your real hobby and not whatever you claim it to be. I have a old guitar that is made out of plywood, cost next to nothing and sounds surprisingly good. A more expensive guitar would not be able to compensate my lack of talent and also only have collected dust over a few decades. Fortunately I have more talent for my new expensive hobby thing (which is often mistaken for a guitar in its bag). Still, it's about 10 years old, I'm at least the third owner and I got it at less than a third of the price of a new one. That does not make it any less fun.
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V. wrote: How can you buy anything so expensive without reading any reviews!
Why would you rely on the opinion of a small, self-selected group of Internet trolls to inform your decision to purchase something so expensive??
Phil
The opinions expressed in this post are not necessarily those of the author, especially if you find them impolite, inaccurate or inflammatory.
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There's a typo in the last panel - s/resemble/reassemble/ 
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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I'm trying to use Edge - for compatibility reasons with a customer - big "we can't go wrong with Microsoft, you will be assimilated, blah, blah, blah" shop. I have purposely stayed away from Edge, because my first attempt strained my brain.
I'm back for round 2.
All I want to do is grab the web address location from the title to the Favorites folder. In Chrome and FF, I can just drag and drop. I think it used to work in IE. With my daughter's help, I have conquered the puzzle.
Microsoft  why?
Does anyone know if Microsoft has a Hall of Shame? Perhaps the Cone of Shame?
Rant over.
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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I have just used Edge in earnest on the WookieTab - I thought I'd give it a try - and ... decided it's still useless and installed Chrome.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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charlieg wrote: Does anyone know if Microsoft has a Hall of Shame? Perhaps the Cone of Shame?
Never visited it, but you could try their Visual Basic website.
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Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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Microsoft's strength has never been high technical acumen. Their strength has always been and will always be putting stuff together the rest of the industry does first and packaging it to businesses and consumers. This will never change. And it apparently works since most people aren't really technical anyway.
Jeremy Falcon
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I tried using Edge and stopped because of compatibility reasons. It won't work with a very simple, twenty year-old web page so I bagged it.
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