The guy talked a lot about "keeping things moving along" and "not breaking the flow" in combat. Hahaha. Made me laugh out loud. Seemed rather ridiculous an expectation to have given that TB combat by definition does NOT keep things moving along and DOES break the flow.
Depends how fast you can make decisions. Get Gud scrub!

But isn't that exactly what many TB fans claim is bad about RTwP and why they want TB? To be able to take as many hours as they want to do one action?

Don't see how you can keep things moving along and have 'flow' with TB combat, but more power to Larian for thinking that they can! And as someone who hates TB combat precisely because of how ridiculously, tediously slow and clunky it is, I'd be very happy if they somehow manage to come up with such a miracle.
I think it’s more about having complete control over what everyone is doing, and not having to worry about characters charging forward and attacking the wrong enemy, wasting their best spell or whatever. Some of that can be managed with behaviors and scripts, but not all of it.
Real time is great for blasting through simple fights, but the more challenging the fight, the more you have to use the pause and micromanage your party anyway. Which is usually fine, but can feel like you are fighting the AI.
Larian are making a game with more complex environments, objects to interact with, and options for both the player and enemy to use that to their advantage. IMO the more of all that they have the more frustrating it would be trying to control it with real time with pause.
It doesn’t mean you always have to do something fancy or agonize over every more. In both DOS and XCom games, I’m usually thinking about options as the enemies move and take my turns pretty quickly unless I get into trouble and have to stop to think about it. It’s probably not optimal, but it’s faster than watching Sven play who explains everything he’s doing.
In the DOS games I spent waaayyy more time managing my bloody inventory than in combat anyway. I think there will be be a lot less of all that in BG3 though.
I’m actually fine with either combat system, but for what Larian are trying to do, turn based just makes more sense to me.