Can't believe I rated early JJK so highly. I should have knew it is shallow as #uck.
Or maybe, Gege did not try to expand the story, add more characters, curses like Mahito/Jogo, etc.
The final arc would have been fine if it followed a ladder type structure where Yuji had to fight several villains to climb up and face Sukuna while Gojo held him back. And the moment Yuji arrived at the scene, he would see Go/Jo on the floor.
Gege should have kept things simple.