But you’ll still know all the things there are to know.
One of the great tricks in game development is convincing the player they have any real control over their character and the story. It’s all pre-written, with a finite ending.
Diablo3 had 28 going on 29 seasons, costing zero, unless you wanted class expansions, or cosmetics.
Diablo4 will likely be little different.
How much ‘and then some’ content do you think you’ll get for your BG3 money?
Again I’m sure BG3 is a fine game, but let’s not kid ourselves.