I think that’s kind of far fetched and unfair to treat Larian as if the existence of BG3 is solely some scheme for them to rake in money using the dnd title. They wouldn’t have made the game if they didn’t WANT to make the game for a genuine reason. Theres plenty to show that the studio was thrilled to have the opportunity to work in the DnD universe and use the dnd rules to come up with interesting encounters and combat scenarios. I don’t think in any way that their burnout or lackluster treatment of the game has anything to do with it being dnd specifically. They clearly just realized they weren’t happy being constrained by the requirements of the external IP once they got far enough into the development process. That’s unfortunate for them, but I’d certainly say toughing it out and working within the constraints of the system is a much better strategy than just ditching it while it’s incomplete. This is why I understand them not wanting to make expansions or sequels, as that would require them to continue to iterate on rules and systems they feel limit their creative potential. But I absolutely don’t think it’s cool for them to use that as an excuse to address some of the remaining issues in the game that don’t have anything to do with the dnd rules whatsoever (making cutscenes and dialogue doesn’t have anything to do with game rules).
Honestly I’ve never seen anything that points towards your believe of Larian “not liking” the dnd rules, and I’ve read every interview or press release from Larian that I can find. It seems like your idea is stemming from one specific line in an interview about their cancelled dlc plans, where they said that part of the reason their hearts weren’t in it was because they had really cool ideas they wanted to bring to life that they didn’t think they could do using the dnd rules. This points towards the point I made above far more than it points to a conclusion of Larian not liking dnd.