Imagine your friend that does not know anything about linux, don't you think this would make them not install the firefox flatpak and potentially think that linux is unsafe?
I ask this because I believe we must be careful and make small changes to welcome new users in the future, we have to make them as much comfortable as possible when experimenting with a new O.S
I believe this warning could have a less alarming design, saying something like "This app can use elevated permissions. What does this mean?" with the "What does this mean?" text as a clickable URL that shows the user that this may cause security risks. I mean, is kind of a contradiction to have "verified" on the app and a red warning saying "Potentially unsafe", the user will think "well, should I trust this or not??"
In my opinion, those warnings are not used to help users but to shame developpers for not trully sandboxing and verifying their apps. Developpers know that having this warning will decrease the number of users downloading it. The goal in the long run is to improve app sandboxing and security.
By not letting the user import/export addon settings, bookmarks?
Btw, i hate the opinion that the dev must babysit his users. It makes software worse, not better, look at Firefox's profille folder for an example. If you have to, make an intro to train them.
I'm not 100% confident but I thought you could use portals to access individual files outside of the sandbox
My bad, i thought that was included in file system access.