I wonder if a threaded discussion where the parent being responded to is always visible as you scroll would be a workable and usable interface? I get turned aro

I wonder if a threaded discussion where the parent being responded to is always visible as you scroll would be a workable and usable interface? I get turned around sometimes if there are dozens of replies to a comment in a threaded discussion, especially when I get to the grandchild or great grandchild comment level. It would be analogous to when people quote entire paragraphs in a forum post to add their 1 sentence reply (which always bothered me for reasons I've never come to terms with). Once I found reddit, I really appreciated the threaded discussion.