I think the origins in DAO was an idea that sounded good on paper, but in true BioWare fashion became a total Charlie Foxtrot. They had to cut half of the origins they had planned, and it’s so much work for content that is inaccessible in any given playthrough. How much better would it have been if the game started in a fixed point and then branched out wildly in the final chapter based on your decisions rather than starting at disparate points and then funneling into the same story? IMO they inverted what makes a good RPG.
Also, DAO only had three races and three classes. BG3 has 12 classes, more races and distinct subraces than I feel like counting, and backgrounds. There is no way DAO style origins would be reasonable.