You do realize USB ports can be vertical, and usually are on (USB-enabled) wall outlets, displays and desktop computers right?
And that's the simple case of vertical (flipped 90 on the long axis compared to most laptops) with USB-enabled extension cords lying on the floor, you plug straight down.
So rotate in one direction for vertical for consistency, and color-code the plug for everything that could benefit from it. Matching red/green is far easier than "which side has that mostly-invisible black piece of plastic".
> So rotate in one direction for vertical for consistency
There is no consistency, your USB port may be on the left, right or back of your screen, what's the useful thing to standardize then? And it can jut out from a wall. And on a desktop tower, the USB port can be on the front or the back, and the user may install the machine so it is accessed from the left, the right or either.
Left/right/back of screen is still the same direction. If it's counter-clockwise from green-up, it's green-left everywhere, including walls. On anything parallel with the floor you're right - so color-code the plug.
You do realize USB ports can be vertical, and usually are on (USB-enabled) wall outlets, displays and desktop computers right?
And that's the simple case of vertical (flipped 90 on the long axis compared to most laptops) with USB-enabled extension cords lying on the floor, you plug straight down.