Yeah, I think we're somewhat on the same page. I've already made some post around this topic, where I mentioned that we use multiple versions of quoting.
I believe having a tag with a mention marker is still useful, as I often see quotes used as comments, they are just quoting to get more attention. They're still contributing "comments," but in a different type of post.
However, separating this as a 'repost' is the better approach.
It might be a good idea to move this discussion to GitHub from now on.