At this year's FediForum one of the breakout sessions centred around the Theadiverse, the subset of ActivityPub-enabled applications built around a group-centric model of content representation.
The main outcome of the meeting involved the genesis of an informal working group for the threadiverse, in order to align our disparate implementations toward a common path.
I've been looking at https://helge.codeberg.page/fep/final/fep-1b12/ which is the closest thing we have to a standard way to do communities. It was written by a Lemmy dev and so Lemmy does 95% of what is described there.
The only missing piece is the replies, which Lemmy devs have no tepid interest in https://github.com/LemmyNet/lemmy/issues/2004. However Mastodon has this so we have an example to copy. I expect nailing that one down will be the bulk of the discussion to be had.
The replies collection is only really really useful when adding a remote community for the first time and back-filling old content, so it's not something that people on large instances will miss very much if Lemmy never implements it.
missing piece is the replies, which Lemmy devs have no interest
If you look in one of the duplicate issues, nutomic says "no one has implemented it yet. Would definitely accept a PR to add it though.", so it's not a matter of "no interest", it is a matter of lacking manpower for it.
@rimu@piefed.social You might wanna update your comment with the info brought by @rglullis@communick.news. Lemmy devs already receive a lot of hate around here and any little thing end up becoming another reason to attack them.