Totally agree! I was so happy when I saw the navigation arrows for the comments but I also saw that holding the up-arrow to get back to the original post would greatly improve the experience (that was my standard form of navigation in Boost as well).
Edit: I guess long pressing the up-arrow was like the “Home-key” and down-arrow like the “End-key” on a Keyboard
Yes! It was always so convenient to be able to filter to e. g. text-only-posts when I was driving via bus or train and was low on data or had poor signal. Hope this will be implemented in Boost for Lemmy too!