Honestly many things because when I came back to JJK around 2023, I followed the hate bandwagon and didn't form most of my own opinions until late 2024. This is mainly bc I was hanging around r/jujutsufolk which was a toxic echo chamber and every post was nitpicky back then.

The biggest change was my perception on Megumi's conclusion. At first I disliked it too like how can a deuteragonist be left aside like this, he didn't even participate in the final battle. We didn't get the usual power of friendship (he only formed a puddle of shadow to distract Sukuna). I was also one of those people who were expecting Megumi's unfinished domain would come into play and that he and Yuuji would fight Sukuna in the innate domain or something. Then it didn't, I was also disappointed. I think it also came from the fact that Megumi didn't want to live for himself but for someone else again, which I took negatively.

Only later I accepted his conclusion made sense (maybe could've been executed better?). He was meant to be someone with lost potential as he never wanted the sorcerer life. I also discussed this with a lot of moots. If you take off the shounen lenses, Megumi's ending is pretty conclusive (not everyone gets a perfect ending. Seems like he will always be the type to live for someone else and it's fine). I was also pissed about Tsumiki being a plot device. Like giving her temporary screen time in the beginning would've helped us empathise with Megumi more. But I just kind of accepted the canon after a while (I still believe she should've been more present). His reaction to her death still hits harder.

I also used to hate Hiromi surviving the battle. I still do but it's not bc of him returning alive, it's just rereading the chapter where he 'dies' doesn't have the same emotional weight anymore now that you know he's alive. But later I was okay with him surviving because a lot of characters already died for their role. I think it's much better for Hiromi to face himself especially standing on trial for the murders he committed.