And if your not part of the main group, what's even the point of federation? It's practically "servers" at that point.
No amount of technology is going to fix the 'a majority of people don't like you or interact with you' problem though.
That's nonsense.
I run my own instance and don't use any sort of ban list, and I can interact just fine with both the "main" instances, and a whole host of smaller, more niche, instances.
it's more interesting because the UX encourages different styles of posting (no QRTs for dunks, for one) that people are developing into slightly different social idioms. also no ads, chrono timeline, pick your own image crops...
I run my own instance. As far as I can tell, this is false. There are some ban lists floating around, though I'm yet to see a common, standard policy of blocking instances because they don't subscribe to a particular blocklist.
media organizations, pols, and public sector institutions do. Your grandma doesn't need to use Mastodon and it's not about her. It's about those who will be followed and have something important to transmit.