Earlier quoted context omitted.
I use the mobile app and its horrible. I can't often save comments, i can't see my comment threads, ... There are probably many HN features nobody knows about because the UI doesn't expose them.
Why are you not using the website? It works really well on mobile and loads almost instantly. I’ve never seen a reason to use app for HN.
My only issue with the website is the little minimize "-" sign on comments is too small and difficult to reliably hit without zooming in. However as you say everything else works much more smoothly than any of the apps I've tried