Yes and no, ideally we would also still have communities. You can imagine how a topic like Henry Kissinger's death could be talked about in both of a politics sub, and noncredibledefence esque military based sub.

The point is basically to give better search functionality and bridge these communities by topic in a way.

you can see one in the other.

Right now, you can't see Mastodon toots unless they go out of their way to link a Lemmy community. I hope we'll get better integration at some point (a way to subscribe to users or hashtags, maybe), because that would give a lot more activity