Liftoff is as close to RIF in terms of function I have found so far (especially with the last update adding comment context buttons), but I am also waiting on Boost for Lemmy to launch to compare, as it has a UI a little closer to RIF's.

None of them have the ability to jump around to top comments like RIF had, but Liftoff does at least seem to want to add those features as they progress, which is another reason I'm sticking with it over Jerboa and Connect ATM.

It's just the beginning of Lemmy. Things are yet to come and improve. Give it time or try to learn how to code and try to contribute.

Jerboa being very unstable, I "downloaded" the website, I don't know how to explain it, android treats it as if it was a stand-alone app. For my usecase, it's similar to RiF, I can't quite tell if there is some feature missing.