And I have more than once bent the tiny pins by trying to orient the plug by feel, and it was a nightmare to fix it afterwards.

You've never ruined a PS/2 port by rotating the plug to find the right orientation?

When I'm trying to plug my PS/2 keyboard into the port in back of my computer which I cannot see, instead of needing to try two orientations, I need to try every orientation.

And USB solved it by having the logo on the upper side.