Really miss the Possibility to create custom feeds, containing different Subs (or communities). For example I had one that I called 3D Printing. When I chose it it was showing me posts from all the communities I added when creating it. So it made a feed containing posts on a specific topic over multiple communities. Especially here on Lemmy, where are some communities about the same topic spread over different instances that would make things a lot easier.
It was a Reddit feature, but I’m pretty sure they killed it with new reddit and it only works on old. Definitely would like to see it implemented on Lemmy itself so I can browse the same ones on my computer as well as the app.
Reddit had some kind of multi-subreddit feature, but regardless being able to group multiple communities with the same topic into a single feed would be a nice benefit.