I'd rather we have something like the ability to share a post but with a pointer to a reply. So it looks like a QP but only to your followers. To everyone else, it is a reply. And this means it stays attached but subservient to the OP.
I'd also like to see all replies rankable ala reddit. This would give us something like Community Notes, where the top responses are show up right under the OP. And the worst stuff for popular posts would be easily ignored.