The main things that made me like reddit were RES and Apollo (or Alien Blue before reddit bought it). I haven't used non-RES reddit or the reddit app in so long because I never enjoyed them. Also thanks for reminding me to cancel my reddit Premium 🙃
I mainly like the enormous variety of topics discussed in one place. No need to visit various forums, it's all just there on Reddit. I hope the whole federation aspect of Lemmy gets a more streamlined feel to replicate this experience.
Because of the various instances of Lemmy it's inevitable that overlapping communities will exist. It would be cool if you could create multilemmies, for lack of a better name, where multiple communities can be grouped in a single view to combine them.