Questions for playing AC6

[Penguin Deus]

but I believe there's a sizeable JP community that's gonna play on PS5, at least the ones I follow online.

This is what I expected.  Of people I know, personally or online, the majority are PC...but I expect PS5 to have the true majority of players (overall), as well as the majority of the Japanese players.  I'm basing this mostly on how things shook out for the other From Software games over the last decade that were multi-console and had online capability.