There's another thread about RtwP. We're talking about 5th ed mechanics in this one.
The crux of the post is essentially how the game doesn't feel like Baldur's Gate 1 and 2 and that many people were expecting or hoping for a game using a modernized Infinity Engine, or at least one very similar mechanically to those games. Essentialy, BG1 & 2 are 20 year old games made in an engine that was designed for a completely different genre(RTS) that just so happened to work with the rules for D&D, and both those games and BG are implementations of the D&D rules into a computerized format, albeit different editions.
Aside from Sword Coast Legends, an isometric RPG in the same style as the Infinity Engine games which was apparently not received very well, and BG3. Even then, I don't see anything in the original post about what edition rules should be used, but even if that was the case, why would anyone release a game using a 20 year old ruleset that has updated multiple times?
The game feels like D&D, and the engine is well suited to it, much better than Infinity Engine was. Even ignoring the turn-based combat vs real-time with pause, the engine in BG3 is much better suited to D&D than Infinity Engine ever was. It feels like Divinity:OS 3 because that series used the engine first, but that doesn't mean people just saying this game is a sequel to Divinity:OS 2 are right, just like Planescape: Torment and Icewind Dale weren't "just Baldur's Gate 3 & 4".