This way when lemmy.world is down its not a big deal because posting to any news community federates to all of the communities instead of barely having people see your post.
I thought that’s more or less how it’s supposed to work now: if someone on instance A subscribes to a community on instance B, the community gets cached on instance A; and users there can post to it locally (and see each other’s posts) even if it temporarily can’t re-sync with instance B.
Is that not how it works in practice?