Ehh I was just kidding around buuuut… I think mass effected shoehorned themselves a bit with be super nice or super evil with the first game and couldn’t be what geralt is. Well, they kinda could but even choosing your gender impedes that. Geralt had the advantage of being just geralt, a character already fully fleshed out through novels.
I think it’s possible to create a customizable character that still is locked to the story, just harder