cause once players notice any decision of build could be undone, decisions become worthless no matter use it or not.
To you and those sharing your POV. Not the entire playerbase, which would be affected by this change should Larian do it.
the point of role play is about you believe you are the character what build up by any decision you made. however, in this respec case, I can only believe myself as a Doppelganger
"I can only believe myself"
Again, your POV, your problem.
Yet you're asking devs to change it for every one of us, essentially forcing your POV of how this RPG should be played, what roleplay is in this case, and what our characters are.