I only use amethyst as mobile app.

Groups are kinda of annoying on Amethyst. You cannot create groups or 'approve' posts on amethyst that are mad eon Nostrudel.

P sure private groups are coracle -only.

Groups / communities are a bit unused and it feels like not much is being done on them.

I hope a proper forum client comes about.

I have no idea about devving, but I would love to see communities show up as Discussion Forums. Doesn't need to be anything fancy just phpBB or even look at the Craigslist forums. Simple and just works

Groups are a mess. Private groups only exist on Coracle, and every implementation of nip 72 works differently. The requirement for moderation killed communities, which is why there's little activity or interest. Coracle ignores moderation in an attempt to fix that, but that means that the UX across clients is very different.