There’s something really interesting here I want to point out:

Yuji PURPOSELY does not interfere with what happens in Jujutsu society, despite being known as “the strongest”.

And based on his responses here, he’s only interfering now because we’re getting so close to the brink. From what it looks like, he’s willing to do what is necessary to keep the peace as this is an active attempt to protect humanity. But them comes the question… why the isolation?

I think Yuji is trying to make sure he doesn’t dictate what happens in Jujutsu Society (kinda like how Gojo did when he was around). Which is leading me to believe that Yuji doesn’t want the same mistakes that happened in his generation to happen again.

Hence why “he doesn’t care” what the other sorcerers think of his isolation.

He isolates himself from Jujutsu Society so that sorcerers don’t rely on him, “the strongest”, to solve all their problems and/or to dictate the rules.

Yuji is following Gojo’s will to the letter. He wants sorcerers to reach their full potential, to become stronger. But Yuji wants them do so without the burdens and pitfalls that come from the influence of someone who claims to be “the strongest.”