DOS2 had a lot of post-market exposition, because of its scores. But the point made is that is not the combat that makes DOS2 attractive.
DOS2 received universal acclaim from critics and very high scores from players, and while every part of the game was praised, the combat was pretty much always applauded. There is no evidence that all of these people liked it in spite of the turn based combat, and plenty of evidence that lots of people genuinely enjoyed it.
So back to my original point: Larian could make BG3 in a different genre, but why would they? They made a thing, millions of people bought the thing, and the overwhelming preponderance of the feedback that they got was that people liked the thing.
They have no reason to change something that isn’t broken.