I don't see how an answer like "in order to enjoy the game, don't play the game fully" could be acceptable ever... (and I don't talk about any abuse/glitch)
Roleplay is a great part of the game. No, your super overpowered build of soul shredding is not the only way to play the game.
Divinity is classless, you CAN go super overpowered and destroy everything easily, that's one of the many ways you can play this game.
But it's not "fully" playing the game.
Seriously, it's always been the same since the first Divinity, early game is great - mid and end game is a walk in the park.
The thing you prove here is that Larian has problem with balancing their games.
From a pure balancing point of view yes their games don't have enough restriction, but this is way better for the roleplay possibilities to stay like that.