Sounds like what you want a microkernel with excellent IPC. There is still the problem of the window manager, incompatible protocols, and backwards compatibility, but I think a very small, robust core with discrete components that communicate in an isolated way instead of sharing resources is the way forward.
If you start viewing the filesystem as a huge global variable, it becomes obvious that something is wrong with modern OS / app design. One wouldn't tolerate this kind of uncontrolled sharing in a regular program; why should we tolerate it in an OS? Permissions help, but don't solve the issue, as they are still an access control measure on top of an already flawed model.
If you start viewing the filesystem as a huge global variable, it becomes obvious that something is wrong with modern OS / app design. One wouldn't tolerate this kind of uncontrolled sharing in a regular program; why should we tolerate it in an OS? Permissions help, but don't solve the issue, as they are still an access control measure on top of an already flawed model.