I don't have a link immediately handy, but there are several interviews where Swen and others say they went with the DOS model because "it's what [they] know". They openly decided not to take risks with their own formula of RPG. They also said in the same interviews that the decision to go after the BG IP was because BG had more name recognition, and that they could use that to show more people "their own formula of RPG" ... meaning they never intended to do anything but copy/pasta DOS and graft 5e wherever it could fit.
If this is true, then there's no hope for BG3. I want no part in such a heinous bait and switch. I guess I'll just have to wait and see how early access plays out to see how serious they are about making either a D&D game or a BG game. So far, I'm not convinced.
