The proposal was intentionally written to be easy to implement. All fediverse platforms deal with follows so handling follows for groups is a simple extension to that.

Some subreddits are still not wanting to move to Lemmy

I've seen ppl saying they don't want to use any threadiverse platform because of disparate communities/threads. This issue keeps being talked about and always generates pretty big threads so its clear that its an issue that causes a lot of users friction. There's also plenty of issues that are way lower priority than this but they're still filed on various projects' trackers.

I think it's higher priority than you do and would contribute to helping the fediverse grow but I don't think we're gonna convince each other so I'm gonna bow out here.