The narrative structure of POE2 reminds me of the Fallout and Elder Scrolls games because of its lack of emphasis on the main story and its focus on exploring.
I don't know of what Fallout you are talking about. Probably not one of the good ones.
BG3 reminds me more of Bioware games, especially Dragon Age with its focus on story and characters.
I know, right? Don't remind me. It's so disappointing.