"So what was one of the biggest changes you made to Divinity: Original Sin during production?
It used to be a real-time game. We made it turn-based. I see that Yakuza has been taking from our book. [laughs]
I asked myself, “What are we doing? We’re making a real-time game because they told us.” Publishers told us that there’s no way you’re going to get your distribution deals if it’s turn-based. It needs to be real-time, blah, blah, blah. We’ve been conditioned into thinking real-time. I was in the shower, I was like, “What are we doing? We’re gonna be competing with Blizzard making an action RPG? We can’t compete with Blizzard, we don’t have the resources. But no one is making turn-based RPGs anymore. So maybe that’s where we should be going.” And that was a really good move."
This was from a just released interview with Larians CEO.
It's not a complete lock the BG3 will be turn based, but it's clear that Larian Studios has a preference for turn based.