Hashtags do not replace groups.
No one moderates them. They’re easy to hijack and spam. And there’s simply no permanence to them.
Which is why, if you actually want to discuss something, it’s better to tag a group. For example, if you want to be part of an actual PC gaming community on the Fediverse, it’s better to tag @pcgaming@lemmy.ca than #pcgaming.
This needs to be common knowledge because people new to the Fediverse do not know about groups. Hell, I’d say people who have had Mastodon accounts for years still don’t know. And that’s a shame.
@fediverse@lemmy.world
The tricky part is, the group-supporting fediverse software and the microblogging software need to improve how they interact for this to be as good as it could be.
Right now Mastodon barely supports group users/actors/accounts, however they’re called, translating stuff from Lemmy’s format in a rather clunky way. Meanwhile Lemmy also has to roughly translate Mastodon’s format to its own, working pretty well all things considering, but leaving clear artifacts (subject line/first line repeating, community mention remaining shown, etc.).