you are still the same person, and you still have to live with the consequences of your past. Also the new tadpole progression mechanic...I don't think a respec will undo or allow you to change that. The exception here are origin characters other than the dark urge which if you respec them into another class that will break at least some if not all of their story as parts of their origin stories depend on their classes.
I'll rephrase. It's a retcon of their class, stats, etc. And the new character still did all the same in-game choices, only they did them as the new them
