I've been wondering why MacOS updates take so long. Surely with how MacOS has a read only root volume and APFS can do snapshotting they can build the new boot i

I've been wondering why MacOS updates take so long. Surely with how MacOS has a read only root volume and APFS can do snapshotting they can build the new boot image while the system is running and then just ask for the user to reboot into the new volume, after that consolidating the snapshots by deleting the old boot image. One potential source of the long update installation time is going to be in how they ship firmware updates as part of their OS updates now and have done for a while (Note that they stopped shipping external firmware update packages for years).