I'm sorry you're not enjoying the combat. Indeed the combat is closer to DOS then DnD 5e. Have you seen Solasta? This small company (17 ppl) made a game bas eon DnD 5E RULEs and from PHB and they follow it 1:1, and it's amazing for combat. Everything that DnD 5e player are use to. Solasta is the first RPG game that i have played that is so faithful to DnD 5E that idk why Larian as big as they are did not follow the PHB. Like you said, Larian Studio have plenty of time to change their trajectory toward more DnD rather then DOS. (And I love DOS2 I have 1200 hrs played)