> it is actually possible to downgrade a flatpak
Only when the version you want to downgrade to happens to be within the last 10 versions! Why 10? Beats me!
Case in point: the flatpak package for the Element messaging client seems to be the preferred installation method for non-debian distros. But for many users, encrypted message search is broken! [1] [2] Some users claim that downgrading can fix the issue, but the flatpak has been updated too many times now for any user to downgrade to an old enough version - tough luck!
[1] https://github.com/vector-im/element-web/issues?q=is%3Aissue...
[2] https://github.com/flathub/im.riot.Riot/issues?q=is%3Aissue+...