There's a rule of thumb I feel is relevant here. You either do many customizable blank slate characters OR you do ONE specific origin character. If you try for a middle road here, balancing that out is going to be hell
There are ways to do it. Though you have to have vision and a clear idea going into it. (One of the fallouts did it... but it did it by having freedom of character trump origin)
Though the funny thing is that neither of those is what the game has.
