From a 2023 POV about desktop OS security running things sandboxed is a _strong must have_. Even for well curated applications, through less so. So I'm happy about the general direction here. But last time I looked at flathub (and related topics), I was quite disappointed to a point that I would say they majorly failed this. Now that was quite a while ago. But just the fact that in a non well curated app store you co…
It does take a while for toolkits to start using them, but AFAIK, as an example, both KDE and GNOME now transparently use portals for the file chooser dialog.
It will take more time for everything to move to newer, safer APIs (Wayland, screensharing portal, etc). The situation is much better than it was a few years ago, though.
And most frontends now display required permissions; KDE even recently integrated permission management in is system settings.
Some portals still need to be devised though, especially for device access (gamepads, webcams, etc).