It's hard to say for sure without the stated reasons but I'd bet that most of those requirements were written following manufacturing mistakes that resulted in injury.
It's much more like the process for standardizing tech specs than the "lItErAlLy WrItTeN iN bLoOd" that people like to claim.
A lot the specific requirements were proactively created because it's easier for everyone if we all just agree that a particular widget will have certain specs because then the engineers and manufactures can behave accordingly without thinking about it and managing it or there were a couple competing "not quite standard" ways of doing something and they just kinda picked the better looking one.
