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@mikedev right, if you relax the constraints and allow for solutions that involve implementor buy-in you can do a lot more, but my own experimentation is scoped to just what one instance admin could do on their own
because even beyond the implementation difficulty, just getting implementors to agree upon the solution is a tremendous amount of work
it's good work and needs to happen, but it's a very long-term process
thinking about fedi migration; it's better than it used to be because you can migrate followers and stuff, but my feeling is that there's a lot of people who hold off on migrating because it doesn't move your posting history and they end up staying on a server that reeeeally isn't a great choice (*cough* mastodon.social)
doing full-history moves "for real" in a comprehensive way is technically challenging; existing threads (which are spread all across the fediverse) would need to know about the new location of every post and swap it in; I can understand why this hasn't been implemented
BUT I don't see a reason why you couldn't have a copy of your old posts imported into your new account!
so I did that: https://git.sr.ht/~technomancy/masto-gear-solid