First, if you are going to judge Owlcat by how complete their implementation the pnp is, then all RPGs based on rule sets are condemned, a complete implementation of an PnP system on a cRPG is impossible, what actually matters is if the developer implemented the rules enough to guarantee fun gameplay and Owlcat did just that with Pathfinder.
About the DLC, sure, that is shit but while there is a decent rooster of classes on the base game and they don't go full Paradox, I'm fine with it.
Larian as the choice of WOTC makes me worried because, Larian always made simplistic lite RPG mechanics for their games, the systems on DOS 1 are pretty barebones and in some cases like the loot system, completely atrocious. The thing that saved DOS 1 was the encounter design and the fact the game was TB, what made the game fun despite its limitations. DOS 2 is another beast because the changes Larian did on combat pretty much crippled the game.
I confess I'm not following everything Swen says and maybe he changed his opinion, but from what I saw based on his reactions of criticism after DOS 2 launch, his whole argument was, "we sold 2 million copies so whatever you say is invalid", Swen repeatedly after criticism of the loot system since even DOS 1, insists on the retarded loot system and his whole argument is that Diablo's Diarrhea of useless items sells more copies and unfortunately he might not even be wrong. After the success of DOS 2, it is to be very,very naive to think Swen will stick to a niche market with Baldurs Gate 3 and the danger is the thinking "Hey, we got all those mechanics on DOS 2 and the game sold 2 million of copies, how about we use them on BG 3, making an hybrid of 5e and DOS 2?"