Honestly the only thing missing now is a good app for iOS. However I’ve been using the mobile browser version and it works just fine. I hope Apollo’s dev sees an opportunity here and goes for it.
You should grab memmy and join their discord. They've posted some screenshots of what the UI overhaul will look like in the short term and it looks incredible. If you love Apollo, it should be a pretty easy transition
I'm sure it will happen. There are already a few apps for Lemmy, and I know Sync is in development. I'd be rather surprised if no other apps are coming..
I don't use iOS, but I know there's an app for it, named Mlem. You could give that a shot, even if it's just a placeholder while you wait for something better. :)