I’m pretty sure Apollo had this - a (floating) button that when clicked would scroll to the start of the next comment thread/group
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Boost also had this handy feature where you could tap a button to see the parent comment. It would open a popup/modal window displaying the comment with the usual updoot/downdoot, quote/reply and parent buttons - so you could easily repeat the process and read the parent context up to the root.
That was handy in long complex threads.