The thing is, I really can't think of any reason why you couldn't have the multiple branching quests without also offering decent character customisation. CD Projekt Red *had* to have their main character be mostly fixed because of the story they based him on, not because that was a requirement for setting up the quests just so--in fact, a lot of the choices in the quests were based on customising the *character* of Geralt as you wanted, even if you couldn't change his appearance.
I guess there's also a Bethesda example which proves this point: have you ever played the Far Harbor DLC for Fallout 4? That DLC had a huge variety of ways to play and possible outcomes, yet it's a Bethesda game with Bethesda customisation. If they could only maintain that level for a whole game (e.g. ES6) then I'd have no complaints whatsoever.