For example I’d like to browse all of the gaming communities at the same time. !gaming@lemmy.world and !gaming@beehaw.org etc. Something like all or local but for custom user created groups. This wasn’t really an issue on reddit, but would be useful the way lemmy works.
Seconding this. I made major use of multireddits in Sync for reddit and would love something similar for Lemmy if possible.
Getting all of my ‘aww’ stuff in one place is the thing I miss most about the old place anyway.