It gives space to do servers based on specific interests if you want. I'm part of a game development server, and my "Local" tab has people on my server often talking about, and showing, things that are related to game development. And I can still follow anyone from any other Mastodon server too.

If you're into video games, film, maybe a specific genre of music, you can have an instance dedicated to that. (It might already exist.) It's like a virtual neighborhood, or forum. Remember forums? Those were nice. They cultivated a sense of community which made people a little more responsible in their attitudes, it feels like. Maybe that's just nostalgia, but I like the server I'm on. It's got friendly people I can talk to without feeling the need to fill my follows with them.