I don't look at stash as UFOs. If I have a group of fabric matched with a pattern, I consider that a planned project. If I have started preliminary work on a top and bagged it, that's a kit, which will likely be used as a leader/ender project.I regard as UFOs finished, unquilted tops, or unfinished tops that have a substantial amount of work done on them.
I agree with the idea that a stash works like an LQS.