There's something to be said for an X like approach where only top level posts are shown, it's cleaner especially on a phone screen. Since the number of replies and likes are shown it's immediately clear which post are potentially worth tapping on and expanding.

Right now BChat's notification system isn't super reliable so it's beneficial to see pretty much everything so I know I don't miss a reply to my post/reply but other than that I usually know when I see a post whether I'm interested to see what other have to say about this, certainly no need to show multiple levels deep by default.