Nowadays there is also more and more nothing shared besides the kernel. Look at technologies like electron, docker, flatpak, etc.
Similar to multiuser: Security is important, but as applications get more and more powerful it is not about what individual users can and can't do, but what each application can and can't do.
Similar to multiuser: Security is important, but as applications get more and more powerful it is not about what individual users can and can't do, but what each application can and can't do.