Linux doesn't really have any distinction between the desktop and underlying OS components in userspace and anything else in userspace. Linux is quite userland-agnostic, and distros have traditionally mixed user software with distro-managed software. You shouldn't use `sudo` to install software by default, your package manager should allow installing software for just your user. Software installed for the system could then be the only software allowed to mark itself as required for interactivity. You could do that manually to other software if you had root access, but "normal" user software installs with the package manager couldn't do so since they wouldn't get root access.

That'd require some new capabilities added, and some substantial shifts in how distro maintainers & users operate, so it's extremely unlikely. It's much closer to how things like Android operate, though still not quite as secure as giving each application its own user & dedicated storage for data.