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The ability to see all the communities if you search them up without having to find it via lemmyverse.net and inserting the specific fedi url to the search bar. It's a crucial thing for an average Joe, no matter it's due to how the fedi protocol works.
Hmm I only browse in mobile voyager and there's an "all" filter. Is that not available?
That 'all' is all of the communities and posts your server knows about. You are on a pretty big (I think?) server, so it's probably pretty good. For people on smaller servers like the one I'm on, it won't have a lot of the smaller niche communities on there as no one from my server has ever visited them.
If I made a new community on my instance and posted stuff there, you wouldn't see it in your 'all' feed unless someone from lemme.ee visited the new community first.
Nice explanation
Someone made a tool for you to automatically add a community to various all feeds from instances that are part of the service. I'll try and find it.