It would be more accurate to describe it as farmers renting out their fields and no longer practicing farming, so they forget how to farm.
People should really know how to delete sims, but there's a ton of obscure Xcode nonsense that in the "old days" people would blindly trust Stackoverflow answers or even blogs to fix. If Xcode is a tractor, it's the old thing you whack with a wrench and say "come on Bessie" to make it temporarily work again, not something most devs really understand.