The review screen has gestures so it would make sense and be more useful to have them in the preview screen too.
I want this too, my usual MO for everything on review screen heavily involves gestures. So for instance, I almost instinctively swipe down when I want to edit a note; being able to do that in the previews would be quite useful.
FYI, I’ve seen people on the forums who use previews as a replacement for reviews, so these screens aren’t very different at the end of the day. If we can have gestures in reviewer, we should also have it here.