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Right. I guess I just don’t understand the use case since I’m used to comment trees (like here on Lemmy) and you’re never confused about what someone is replying to since the comment being replied to is always just right above.
It’s used in the context of a micro-blogging platform where your feed consists of individual posts that don’t show the whole comment thread. If I replied to a post on mastodon, my followers only see my post on their timeline unless they click on my post to see it’s context. A quote post can be used to present someone else’s post to your followers, with whatever you want to say about it.