Right now we only have the Frontpage (subscribered communities), local (Instanz) and all, something I miss would a similar feature like multireddits we had on reddit. An own Feed or multiple different Feeds with each their own subscribed communities. Pluspoint if these communities do not show up in the Frontpage list :)
I believe most common use case is NSFW multireddit/multilemmy (you dirty pervs). I have resolved this by having own account for NS stuff in lemmynsfw, and because all clients support multiple accounts, you just easily jump between them.
Good thing is that it by-structure separates everything.