About 3 years in, and same as it has been: Discovery's kinda ass if you're not on the big servers. This is both a positive and a negative. In most cases it leads to a lack of content directly, and for services like Lemmy, it leads to communities being more dispersed.

I think giving servers the option to run on a whitelist basis instead of a blacklist for other servers would be good. Federation is cool for a lot of reasons, but if your goal is to be a dick you can do that on a $5/mo server with a few cheap domains. Plus I've wanted to self-host some things that I don't necessarily want federated, like Bookwyrm. I was looking at setting one up as a fanfic sharing thing, and a lot of fanfic authors don't want their stuff on platforms like Goodreads for valid reasons, and I personally feel like having it federated would kinda defeat the purpose there. While I was typing this out I just had an idea that might have fixed that problem, actually, I'll test that later

In the same vain, allowing servers to share their blocklists with other servers would help a lot as well. Yes you can see the block list publicly (though some servers do disable it), but manually copying it is a massive chore, and keeping it updated is even worse.