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I think what you're looking for is Qubes OS https://qubes-os.org

I think you're just going to see more stuff become a Web app. Sandboxing doesn't make much sense with a system utility like this.

Isn't that what Microsoft are attempting with the Windows Store?

IIRC Windows Store apps don't run in the same way as regular Windows applications, they run in a sandbox.

I hope I can make Redox be that operating system.

So... SELinux?