I have a different (possibly more stupid) question: why are computer numeric keypads and phone keypads reversed from each other? This gets even worse when entering your pin for a bank; I've seen both layouts used by banks.
I think the answer is, "That's the way we've always done it!" Somebody made an arbitrary and capricious decision many years ago, and nobody has had the wherewithall to change it.
Another "standard" that bothers me: In the transition to digital video, they had the chance to do away with the PAL/NTSC dual-standard nonsense... but they still chose to support both 50 and 60 FPS video?!? As I understand, even 4K video comes in both 50 and 60 frames per second variety, because obviously we still need to synchronize our video to our AC line current...