@PeterCxy Because a desktop's security model is inherited directly from the 1970's time-sharing mainframe systems like Multics and Unix, the only objective of these system is allowing each user to connect via their VT100 and run their programs without affecting other people, damaging system file, or becoming root. Later workstations/desktops shared the same needs.
Protecting a user from the apps, or protecting apps from other apps is only a recent development in today's "there an app for that" world.
@PeterCxy The current problem of (most) desktop's security model:
"If someone steals my laptop while I'm logged in, they can read my email, take my money, and impersonate me to my friends...
But at least they cannot install device drivers without my permissions." 🤣
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