Being able to mark post as read, and have them be hidden from my feed. Or hide posts I have upvoted/downvoted.
Also it would be really nice to have the ability to group communities together from my view point. So instead of a single lemmy feed with all of my subscriptions mixed together I can have multiple feeds each based on say a single topic. Say I have a group called Gaming. and in that I have !gaming@lemmy.ml and !linux_gaming@lemmy.ml !gaming@beehaw.org etc.. etc.. I think this would also help the issue with having similar communities on multiple instances. For example We have !technology@lemmy.ml !technology@beehaw.org I could subscribe to both and just use a single group to view them both. Instead of having to view one at a time.
Edit,
Oh here is another one. It would be great if lemmy links were automatically converted to your local instance.
For example someone linked this https://lemmy.blahaj.zone/post/61827
Sure this works for everyone but it takes you out of your lemmy instance if your not using lemmy.blahaj.zone. I am a user of lemmy.ml, so from my prospective going to lemmy.blahaj.zone doesn't give me any options to interact with that content. I would need to manually find that post from my instance that I am logged into. From my prospective that link should have been converted into lemmy.ml link and go here https://lemmy.ml/post/1160417 so I can seamlessly interact with it.