I know that Chrome on Windows tries to lower its privileges to mitigate exploits...

asveikau 84 days ago | parent | context | favorite | on: Local privilege escalation via execve()

I know that Chrome on Windows tries to lower its privileges to mitigate exploits, and although it's not very popular, the MS Store app platform does try to do full isolation of apps. So actually, per-app separation of users kinda does happen, or is attempted on Windows.