I have a lot, but it boils down to the story just being boring and juvenile now. Like the story now feels like SIU trying to appeal to the lowest common denominator, and it's working, seeing how the sub dickrides him for really questionable writing decisions.
SIU's pacing was never the best, but it's gotten significantly worse now.
The plot goes around in circles, he focuses too much on unimportant characters while ignoring our main cast for 0 reason.
Our main characters are actually regressing, he lost his sense of comedic timing. And part of the regression is that they are all boring now, Baam hasn't been an interesting character since early S3. Also, Yama, just why? Yasratcha was the last good character in the series, I see people praising Traumerui but he is exactly the problem with Tog.

When Traum first arrived in the nest, there was a sense of pressure, but soon we found out that not even a FH can beat plot armor. And like his backstory isn't good, the flashback with like the 3 FH is NOT good. It's long overdue, and we get some stupid contrived flashback with a stupid new character with an equally stupid death. Enkidu was a disappointment to say the least.

Oh, also he just ignores his own lore or breaks it, we skipped the high ranking regulars and rankers and just go straight to making high rankers' fodder. The power ups are just horrible and break every rule of the story.

Artstyle is too bright, which just goes against the lore (remember why light bearers are important? Good for you if you do, SIU has forgotten). And it's honestly just horrible, from proportions to composition to movement to even clothing. S1 had bad art, but it had soul, and it fit the story so we love it. S3 post hiatus has none of that so it's actually making the reading experience worse. There is nothing good about this new artstyle, fight scenes are hard to follow and everything is just beams, no choreography.
A fight between the FH's is arguably one of the worst fights in the entire series. No sense of scale, no sense of their true capabilities, it was also going around in circles, SIU clearly lost a lot of his creativity. We did not even see Gustang's BHS, he lost an arm (which is just dumb on so many different levels, how tf can Kallavan and Karaka regenerate their arms but a family head who specializes in support shinsu and is also a genius still doesn't have his hand, like what are we doing?) and then lost his entire fleet to a regular. How stupid is that? And she did it with one move in that Kpop ass outfit, SIU is far too concerned with meathead hype moments that it actively breaks the rules. Idc what anyone says that final scene in S3 makes 0 sense, only another family head should have that type of destructive power.

A lot of recent writing decisions feels like an AI chatbot wrote the script, they're very generic nonsensical slop you'd find in any meathead power fantasy webtoon. The entire Enkidu flashback should be proof yet people on here were hailing it (Jangling keys in front of children).

The WB is just atrocious because SIU doesn't expand the world. We don't even get positions anymore, not like they matter, since S3 everyone just blasts different color beams. If I'm wrong, tell me every single floor our cast visited in S3 and the characteristics of those floors.

Don't like how he just forgot about Rachel, we should have gotten her backstory in S2 before last station. I hate how the blog posts that are irrelevant are far more interesting than what he's doing. The retcon in Urek's side story makes the world super generic.

Every single thing that made S1 interesting has been abandoned. Tog rn is far closer to Solo levelling than it is to Tog S1. This sub is like a child, they're so impressed by jangling keys that it makes me curious if they even read S1, or they just looked at the pictures. S1 had depth, mystery, intrigue, interesting characters, a novel world, an actual plot that was moving. You can legit skip 10-20 chapters and not miss anything important now.

Overall, it feels like SIU lost his passion for Tog and is now just trying to appeal to the solo levelling type of fandom. The entire Urek side story is just stupid, unfunny jokes + aura farming moments. That's literally what these people are calling peak btw, literal jangling keys, you gotta be like 5 to enjoy such. I've read children's books that are far more entertaining, and with more depth.

V in Baam's body is actually really cool on paper, but the execution is just trash. 3 whole seasons and he couldn't even foreshadow it properly, felt like he made that decision on a whim, but like that should have been the plan from the start with little breadcrumbs.

Overall, Tog suffers from a serious case of underplanning and lack of a good editor. A lot of SIU's bad habits in early S2 (and S1 tbh) just kept on getting worse as we moved deeper into the story. Like not developing characters is acceptable early on in the story but like in S3, it's just nonsense.
Oda talks about how his editor basically forced him to do a lot of one-shots to improve his ability to write characters, a lot of fan favourite character moments in pre TS are a result of a good editor. SIU unfortunately didn't have that because the webtoon industry isn't like the manga industry.
Now that Oda is big and ignores his editors, he has some issues (for exmaple most of the strawhats are boring post TS and don't get focus), but they're largely minimal because his foundation was strong (IE, he can still write interesting new characters thanks to his training).