Lemmy wasn’t made for decentralization, anyone who says that is a liar, it was made for tyrants to create their own sanitized space for members of their cults to get together.

Still though it’s the best we have until Nostr officially has widespread support for Communities and has a Decent Reddit style frontend. At the current time it isn’t really viable due to the fact it’s currently a Twitter clone that doesn’t facilitate this kind of discussion thread content.

Also No, Hashtags aren’t communities, they are the equivalent of post or comment flairs and trying to use them as a community gives a very messy and cluttered feeling.