I think youre missing the point. Itadori wanted to be a cog (or plot mechanism) for the jjk society so ofc he had no real motivation other than exorcising curses. Plus Sukuna is a curse similar to mahito and both deaths were equally pathetic so that was probably intentional as well
Idk what "unresolved plot holes" everyone is crying about, so i believe its gonna have a great ending on par with the rest of the series. Ofc a lot of people will hate cuz their personal fanfics propably wont happen.