some meta-information that's probably hidden by default.
Who says it's hidden? There's nothing special about a a filename that means it is visible in the UI. As this very story shows.
You're thinking is being limited by what you are used to. You're lacking imagination to envisage better alternatives.
No, I just envisage what will happen when this is introduced on Windows, with its huge established software pool that doesnt understand that metadata.
Personally, I'm still rather fond of a capability based OS, instead of a rights based one. And the idea that executables can access ANYTHING outside their own directory without explicit permission was stupid from day one. I can imagine quite a view changes that would make an OS much safer.
But adding metadata to files that is not "in your face" is not the best suggestion I've seen for that. And yes, the Explorer could be changed to show status. And a gazillion older programs would not. Because it could have been done already, and it hasn't.