We are getting there on Linux too - with atomic or image based updates of the underlying system. On servers you will (or already) have A/B partitions (or ostrees), on mobiles and IoT too, some desktops (looking at Fedora) also prefer reboot-update-reboot cycle, to prevent things like killing X while doing your update and leaving your machine in inconsistent state.

macOS also does system updates with reboot, for the same reasons.