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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As a work around, you can tap on the comment to hide its children, or if you swipe to the left it will collapse the entire thread.
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.