if not tied to background or for ex. what you were doing at the time you were abducted, would anyone be opposed to having class specific quests available for your pc? the original bg2 even had questlines where you could gain your own base by completing your class related questline or would that be too prescriptive?
it would be neat to be able to customize elements of the custom pc character to make them feel more connected to the world from a gameplay mechanic or story hook aspect particularly when compared to the origin companions whom share the same tadpole concern while still having their own personal plotlines, and i get that some ppl may prefer to roleplay and create the story and background for themselves as they play the game and all the power to you, but that shouldnt preclude larian from being able to introduce more possible mechanics that responds to this feedback. even if just to determine when/where we got scooped up by the mindflayers would be an improvement