>which is not the default state on any OS
Irrelevant. It could be intentionally or accidentally disabled by the user.
I don't know why you are so annoyed, but I know for a fact that average non-technical person is incapable of sharing files over Bluetooth on their own, and this probability of incapacity increases with age.
I'm annoyed because it doesn't really matter, misrepresenting the situation by adding steps that aren't really there doesn't strengthen the case, it makes it sillier. I would guess it's more likely that people don't know to use Bluetooth for sharing, more than they simply couldn't figure it out. And to be fair, why would they?
There are a lot of things where simply knowing to do them is a large part of the problem, rather than a literal inability.
I don't know why you are so annoyed, but I know for a fact that average non-technical person is incapable of sharing files over Bluetooth on their own, and this probability of incapacity increases with age.