Here is something that most hololive fans are not aware of.
In Nijisanji there is a clear separation between the JP and EN branches. They don't intereact hardly at all. The JP talents don't even know the EN talents exist, and the EN talents barely, if ever, interact with the JP talents. They might as well be completely different companies.
Fans of the EN branch sometimes watch members of the Korean branch, or Indonesian branch, because they sometimes speak English in their streams. But they almost NEVER watch members of the JP branch. There are so many JP talents, that remembering them all is pretty much impossible anyway. Even the JP's don't know all the JP's, there's like 400 of them or something.
This is entirely different in Hololive. The English branch is so weak, that Hololive fans often find themselves watching JP streams. The JP talents are heavily advertised in the Global thread, so the EN fans are well aware of most of the JP talents. That's why when you see Hololive fans trying to criticize Nijisanji fans by referencing their JP branch, most of the English speaking fans really don't know what the hell you're talking about.