@jonah @Jonathanglick Given that the URL is the identifier and the URL defines where the post is hosted, it is quite unclear what migrating posts would mean.

Reposting them in the new place, back-dated? Will I receive 10000 comments on old posts from years ago when someone I interacted with a lot moves? My comments on the original comments would still hang off the original comment anyway.

Should the original server redirect to the new post location? In the most important reason for moving posts, the original server closing down, this won't happen anyway.