Yeah it’s there “This house is full, please go to another one…” but unless you know what’s up. That could be a huge deterrent to new users which I don’t think it’s the goal. I now know how this fediverse thing works and that it doesn’t really matter which instance I’m using. But for a lot of new users that concept doesn’t even register. So it needs to be more transparent from a UX perspective. Sure we could leave it as a sort of “gatekeep” and from a certain point of view it makes sense. It all depends on what the lemmy devs what to achieve.
You don’t have to find an instance for X, just a community. Go to the communities tab and search for ‘plants’ and see what comes uob. It’ll show the communities in your instance and then in other instances. Click onntnem subscribe its all connected.
Then on your Frontpage there is a tab on top between Subscribed, Local, All.
Subscribed shows posts from everything you subscribed only. Local is posts from your instance only All is posts from all instances federated.