It's a single player game where the difficulty is easy enough that basically any somewhat-competent build can breeze through combats with a little forethought and preparation. Min-maxing isn't going to take any fun out of it.
This is D&D though and that may not hold through later in the game. The early levels are generally easy enough even at the tabletop but things tend to get real as you start facing higher level enemies. And early access didn't include any major boss fights like the avatars of the dead three. Combat can get a lot more real. But yes, it is a single player game so anyone can min-max all they like.
