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A part of the problem is that there are multiple similar general topic instances/sites to choose from. If there were more dissimilar, specific topic instances/sites it might help reduce the choice paralysis a little.
It might even better help highlight the perks of federation, as it would be easier to be like, “See, even though you’re on cuteanimals.posts, you can still check out and comment on stuff besides cute animals if you want.”
The tricky part is, the group-supporting fediverse software and the microblogging software need to improve how they interact for this to be as good as it could be.
Right now Mastodon barely supports group users/actors/accounts, however they’re called, translating stuff from Lemmy’s format in a rather clunky way. Meanwhile Lemmy also has to roughly translate Mastodon’s format to its own, working pretty well all things considering, but leaving clear artifacts (subject line/first line repeating, community mention remaining shown, etc.).