On the contrary, a VERY large portion of BG3 fans are not fans of turn based games.
Not really.
The only people complaining against the turn-based combat were a small minority of people who begurdged the fact it wasn't so in BG1 and 2.
Personally, even as a fan of the old Bioware titles, I found the passage to turn-based arguably the main NET improvement Larian introduced to the series.
I think you're underestimating just how much BANK they got from BG3.
They literally went from a failing company (As DOS2 was considered a flop due to poor sales performance)
What? No, it wasn't. DOS 2 was a massive hit and it sold almost 8 million copies in a genre where most of the competitors would be ecstatic selling few hundred thousands.
A lot of people who never cared about the BG series in the past (their loss, really) were thrilled about BG3 because "it was from the same studio that made DOS 2".