That was definitely a controversial move. 😂
I think it’s “easier” when you first come to Lemmy (or similar) to join the biggest server with all the communities. Being able to interact with communities everywhere, despite where your home instance is, takes some time to conceptualize. I actually think Lemmy has been easier to understand with that than, say, Mastodon.
I’ve made edits and deletes, and as far as I can tell, once the instances sync up, those edits/deletes are synced as well - I have noticed a delay, but it usually kicks in like overnight (for example) when I make a change using my account on lemm.ee for my account on lemmy.world to see it, etc.