This is probably not the manga for you. You will enjoy things like Naruto or Bleach better. Instead of "demanding" Gege to change, please understand that many of us enjoy this style of writing and the way the story is developing. I enjoy piecing it together instead of having huge signposts for every little thing. I don't know how anything you have said that was revealed should be a surprise, people have been theorizing and putting these things together forever. It does not have to cater to you and can't cater to everyone all at once. Just find something you like instead of demanding it be changed so that you can enjoy it better.
It's fair game to offer constructive criticism for fun but flawed creative works. Also, let's be real here, what was there for you to piece together? NONE of this last chapter's impactful developments, save one, were given foreshadowing. The only thing we all saw coming was Yuji eventually receiving Sukuna's cursed technique. Except there's tons of foreshadowing that he'd receive a different one. There's been foreshadowing that Yuji was a failed attempt at deliberately creating a "Toji Zenin", and there was also foreshadowing that Yuji should by rights have inherited a cursed technique from EITHER of his parents, OR from Kenjaku himself (who had parasitized Yuji's mother prior to his birth).
Also, how does it make sense that Yuji has cursed blood manipulation from eating death womb paintings four through nine? The only death womb painting to have that technique is Choso, the other two living/incarnated ones had different techniques. Also wouldn't it make sense that Yuji would develop ...five different techniques, possibly, from eating those five death womb paintings? Why just the one technique, and why THAT one?
I didn't suggest anything that was revealed was a surprise. What was surprising is how little dramatic impact the author decided to imbue. Yuji suddenly developing not one but TWO cursed techniques, and learning how to make each and every blow a black flash, AND turning out to be Sukuna's nephew, AND... you see?
Gojo getting off-paneled by Sukuna is like your favorite porno cutting away to commercial right before the climax and then when it comes back on, you find out Dirk Diggler's dick FELL OFF right before the money shot and he spontaneously decided to never appear onscreen ever again.
Imaging if this were Game of Thrones, you were watching the red wedding, and everything looked like it was going to work out for Rob Stark, then literally next episode you find out "yeah, no, everyone died, Walder Frey betrayed them and killed them all" but it was all off-panel. No "Rains of Castermere" played by the band, no pregnancy belly getting repeatedly stabbed, NONE OF THE DRAMATIC MOMENT.
This is what's happening here. This shit's amateurish. Or just lazy. Or Gege's heart's not in it anymore. Which happens. I mean look at what happened with Bleach...which honestly has pretty similar strengths and weaknesses to JJK, and we know Kubo Tite just wanted it to end:
-Great character design and superpowers
-Abysmal character development
-None of the villains seem particularly compelling outside of their omnipotence
-The main character's origin and powers are CONSTANTLY getting retconned with more added in, to make him personally relevant to both the heroes and the villain.
TBH, the only thing really separating JJK from Bleach is Kubo at least had decent female character design.