FWIW, local git clones use hard links for object files, so share a lot of their data.
https://www.git-scm.com/docs/git-clone#Documentation/git-clo...
https://www.git-scm.com/docs/git-clone#Documentation/git-clo...
Sure, you can change back origin to point to the central one again, but you still have to do a dance to sync branches among your local clones (and I’m not sure what happens to the hardlinks).
worktrees just naturally basically are “views” of the same local repository, which may hang off a central repository (or not).