It's an absolutely insane and frustrating UX. Things slide in from different directions and there are multiple UI elements with similar (but not identical) functionality. That's on top of crap like not being able to download gifs and videos right to my device and the built in video player being broken. There are so many other major social media apps that do things so much better it just boggles my mind at how bad reddit's is. TikTok is so smooth and easy to use, even Facebook is better.
In Apollo on the other hand, I view my comments by tapping the "profile" button at the bottom of the screen. In a comment thread, to view a user's history, tap their name and their history pops up. It's smooth and intuitive and fast and simple. I always "go back" views by sliding from the left - the interactions never change depending on context so I always know exactly how to navigate intuitively.