That only works if

1. The cable has a logo.

2. You can see the logo.

3. The device and cable both conform to the standard.

4. The port is not vertical.

5. The device you are plugging in is not on it's side or upside down.

6. The user is sober and of a clear, calm mind.

The USB ports on my computers aren't all oriented the same way (even on the same computer / motherboard), some USB peripherals are labeled on the "right" side some on the wrong. Sometimes even when you have it oriented the correct way, it doesn't always go in because you have it slightly cockeyed. Sometimes its dark and you can't see which way is up.

There are many reasons why single-sided (but not obviously sided) connections are hard to plug in and most of them don't have to do with the user being stupid.

Unfortunately, the original USB spec recommended connectors with spin-1/2 rotational symmetry, so you sometimes have to rotate the plug more than 360 degrees to make it fit in the port.

Eyes should not be mandatory to operate a USB cable. I can think of no other consumer cable that requires me to stare at it while I plug it in.

True, but sometimes it is not easily visible, or you want to plug it in without looking at it.

Agreed. I manage to do it in the dark every night plugging in my cell phone. Really...

We are all complete oafs.