I moved from Lemmy.ml because I liked the name of Lemmy.world and it ran a newer Lemmy version which meant I could make communities. I moved from Lemmy.world because they defederated from piracy communities they didn't even host (but for some reason still kept the small piracy community they DID host) From thelemmy.club because I couldn't see the Hackintosh community from there (probably defederated) Now I spent some time looking on join-lemmy.org and checked out some instances and this (lemy.lol) instance seemed good, so I chose that.
You're right, but there's more to appreciate about needing to choose an instance.
It's like email. All email services work with all others, but the end user still needs to choose a good one. There are more than one "good one"s, and part of the decision is about personal taste.
And sometimes you have to leave a bad provider for a better one. Look at my account, it's brand new. Because lemm.ee has had one too many federation issues for my taste.
Ok, so your argument is basically "Look at this unrelated service, that's how it works too, so nothing wrong with the current service except that I had to do the thing that proves that what you're talking about would be better."
Eliminate the central authorities altogether, let people curate their feed so they don't have to worry about someone else making choices about their experience.
Someone could join Lemmy today and have no idea they're missing out on a big part of the available content because they joined the wrong instance, they would then turn around and just go back to Reddit where they know everything is available and they're in control of what they're subscribed to and what users they want to block.