So far, OBS, Pomodoro, Denaro, and further down the page GNOME Application Platform Version 45 are the only ones that have this message below them.
I don't use OBS on Zorin (yet), but I'd like to understand what causes them to stop receiving updates.
Worth noting that these came pre-installed with Zorin OS Pro. I didn't install them myself. It's not an urgent issue, of course, but it'd be nice to know why they were installed but can't receive updates.
Yeah, that's normal with Flatpak packages. After a while, the underlying runtime required to run gets updated and you need to uninstall the app and re-install it again, which will download the newer required runtime for you.
So much for being always up to date... at least they warn you about it.
Yes, it is. And as you say, they do get a lot of praise as the best package format out there in the ether... but people conveniently forget to mention things like this.
But unfortunately that doesn't work in every Case because the Developer have to update to a newer Runtime. There You can only hope that this will happen.