One thing I'm missing compared to Apollo in terms of gestures is that Apollo always kept track of the previous thread I had open and allowed me to go back to it by swiping from the right.
For example if I'm reading a comment thread, decide to go back to the feed but then change my mind or quickly want to read something again, I swipe left from the right side of the screen and I'm brought right back to the comments at exactly the same spot as before.
Might sound like a small thing but I was using it a lot.