So, as I’m reading this threat to learn some etiquette myself, infer the ‘user’s not wanting their “local” page to include duplicates’ to mean that when posting to multiple communities, it would be a best practice to only pick one relevant community per server instance?

Like in this case, it was crossed to both: ‘worldnews@lemmy.world’ and ‘world@lemmy.world’

In order to avoid duplicates, only one of those should have been included?

Like community1@server1 community2@server2, etc? If there’s two relevant communities, just pick the best one?