The comparison I had in mind was top-level web domains - there was all these plans (e.g. .net should only be for ISPs and telecoms businesses) that were ultimately ignored.
I came across one issue moderating a lemmy.world Community from a feddit.nl account - the pin I put in a post only happened on the feddit.nl copy, it didn’t federate across to any other ones. That’s the only prob I’ve encountered so far, though.