Crazy talk, and you’re onto something… that’s been solved already.
First part: you hate that a 10+ years old game is only getting cosmetic changes instead of a rehaul of the whole character model. That’s crazy, nobody’s going to do that, not the ones expecting a profit, and not the modding community doing it for free. If you feel it’s a silly change, you’re right, but realize that it’s the only change they could do.
You’re onto something: body feature sliders. Male, female, giraffe, and turtle bodies, have some structural differences, that however mostly match to the same bones having different shapes. The solution is a body shape slider, or 50. It’s something that existed, in some games, since at least the 2000s. Others were lazy and didn’t do it.
For reference of how far this could go, the following all have the same bones, only change in shape, size, and muscle placemen:
Well, there is an OpenSource client, and private servers with custom rules. That makes every modification possible.