It'd be awesome to be able to quickly go back into a previous version, grab a component that mysteriously disappeared (due to a crash or whatever other unknown reason) and bring it back into the current version without having to go through the whole process of promoting a past version (whcih, in addition to being annoying, non-obvious, and needlessly many steps, just psychologically feels a bit like you're risking losing all of the work that you've done since that version - and that's very much not a feeling you should be instilling into users who are already annoyed at losing work).