There’s a similar (maybe even better) feature that was popular in Apollo, which is that, in the comments view, you had a button in the bottom right (position configurable) that, when tapped, would scroll you to the next top-level comment, and if long-pressed, would scroll you to the previous top-level comment.
This is super useful, thanks for sharing! This should be included in an orientation like “first time using Lemmy?” or something, though I have no idea how that would be organized.