You have described what games of the past have done.

I cannot find any fundamental limit in your argument though. Those are all problems that could be solved.

Also I dont see that there are many variables for the body:

- height
- width
- fat amount
- muscle amount
- length of appendexes (arms and legs) relative to body size
- size of hands and feet relative to body size

Thats pretty much all I could think of.

But even if one could only vary height and width that would already make sure that there is more visual variance than there is now in BG3.