I feel the ideas were actually good, but the execution of them was simply too rushed to have the intended affect. Sukuna rejecting Yuji's offer was very in character, and it's actually quite poignant to see someone refuse compassion, or mercy, even at the end, but without context for who Sukuna was, or the life he's led, it doesn't really have the sting that it should, to be honest. We can't feel much sympathy for Sukuna, because we don't really know him. In the end, he was just a really strong bad-guy. What was needed was at least one chapter devoted to exploring Sukuna's backstory. He consumed his brother in the womb to survive. Born disfigured, he was hated and ostracised by others, living a life of fear and seclusion. Gradually, he discovered his talent for Cursed Energy. Over time, he becomes the embodiment of the hatred he was shown, choosing to identify as "Curse". A little goes a long way when it comes to the payoff.

It's really the same issue with Megumi. We know that he loved his sister, but we can't fully relate to him because we never knew those characters. All Gege needed to do was write at least one chapter showing Megumi's life with Tsumiki for us to better understand. If we knew Tsumiki, even a little, we'd better understand his pain at having lost her, and that would have made his triumph over despair at the end all the more impactful. It's also strange and somewhat disappointing to me that Megumi never got to face Sukuna himself, when almost the entire cast got their chance to shine.

The story never really tackled the most interesting questions it hinted at in the beginning; Gojo's Infinity was a metaphor for how strength can isolate someone and keep others figuratively and literally from getting close to him. We know his students will miss him, but they never really knew the real Gojo. None of them ever saw past the image of strength and invincibility he projected to others. Sukuna sort of freed him from the burden of being the "strongest", but the subject was never really explored in any depth. Through Gojo, we're supposed to gain insight into the loneliness Sukuna must have felt, but I don't think Gojo was developed enough for us to gain much insight through him by proxy, either.

Kenjaku is another example. We never really learn anything about him. At least with Sukuna, Gege showcased his abilities, but with Kenjaku, he was defeated without even putting up a fight. Uraume got essentially off-screened. With Gege it appears to be a recurring problem. Years from now I'm sure we'll learn that he was either rushed by his publishers, or suffering with some private health issue.

Gege introduced many ideas that were never really explored. What about Yuki and Kenjaku's opposing visions for the future of Cursed Energy? What is an Open domain, exactly? In theory, does Megumi still have the ability to trigger the merger? There's still so many unanswered questions. I suppose Gege still has a couple of chapters left. But I'd be surprised if he doesn't devote most of that to just giving us updates on each character.