the thing about JJK is gege desperately wants to be like Togashi but he is only good at getting around halfway there and then it dawns on him that he wrote himself into a brick wall even though the lead up to said wall is usually very good.
Gege is an example of someone with a great imagination and creativity that needs someone to help rein his ass in
I think another of Gege's major failings is his absolute lack of wanting to create genuine character interaction just to get back to the fighting and thus, alot of characters' don't have the interactions they should have like with Yuji and Kenjaku when we find out Kenjaku infiltrated his MOM and allowed him to be born in fact, Yuji "not giving a shit" when his grandfather tries to tell him is apparently supposed to also be that we shouldn't care but it doesn't work.

We get Maki literally destroying her whole clan but one quick ass scene later and there's absolutely nothing about the long lasting consequences of literally wiping out your entire clan right down to a single person(Megumi) when in better manga, this has completely defined characters for less(Scar).
Let's not even get into the nonsense that is Tsukimi and how absolutely worthless she is just so that we can get Megumi falling into Sukuna's clutches with none of the actual pathos in actually being attached to her as a character only for her to be taken over and killed and her body destroyed.