You live in a world where you'll get a ticket for not wearing a seatbelt, where ladder manufacturers have to put a sticker on the top rung of a ladder telling people to not stand there and where maintenance staff has to put out yellow signage warning that a wet floor is a bad place to be walking so people don't bust their heads.
The world has to be designed for regular people, not ideal ones.
If 1D&D was a fantasy heartbreaker someone was publishing on DriveThruRPG, sure, they could design it the way you suggest, but Hasbro wants D&D to be unbelievably mainstream and is hoping to have every household in America own a PHB. You bet they're going to try and make it as user-friendly as possible.