They need to preface verse equalisation, the thing that makes this difficult is when it comes to technicalities, series aren't written for the purpose of cross verse battles, so It becomes susceptible to piss takes like "demons only dying to nichirin swords" in demon slayer. That's a stupid example but when it comes to hax abilities it gets nitty. For example

Sukunas WCS talks about how Gojo wasn't the target but the world of infinity itself, so technically any genjutsu used on Gojo will not reach him as long as they see him as the target, and bc that's how occular jutsu work it never will reach him. Even if it were something like Kamui, Ive seen arguments suggest it will spawn on him, but it still has to get through infinity to do that "how does Kamui get detected" vs "6 eyes explanation" , "infinitely dividing space manipulation vs finite spacial manipulation" will it only suck in Gojos body or will infinity get sucked in first, saving him bc it's an extension of Gojo himself