As a ~20 year vim user, and by no means a proficient power user (any time I end up in recording mode, I just mash ESC repeatedly until this start behaving normally again.), I think it's just "it's easier for someone that doesn't know how to use it to learn, than it is for everyone that already knows how to use it to relearn".

Like the damn scroll options on laptop trackpads. Multitouch scroll down = scroll down. Then someone decided it needed to match the way phone scrolling works after smartphones became popular, so now there's lots of scroll down = scroll up software behavior. But the options are still there to behave neither way. If you don't like the vim commands, you're free to install something that behaves in a way that you expect. If you do like vim commands, install it and get the behavior that users have come to expect for the last 20+ years.