@taylorlorenz There is currently only one full-time developer working on the core Mastodon software (server and web app), and this is barely enough for keeping the lights up (bug fixes, security, maintenance…).
Big feature work takes a lot of time and unfortunately Mastodon gGmbH does not allow more at the moment.
Volunteers (like me!) are always welcome, but such a big work as Quote Posts require experience that few people have, and time that even fewer people have.
dgoldsmith