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In addition to what was said by somebody else about atomic updates, even a simple update via package manager on a regular distro will do all the work up front, and not take extra time on next boot. Before you reboot, most things will continue working fine - and most of the remaining things that might not can be worked around.
And reinstalling the packages, moving over all the configs, setting up the partitions and moving the data over? (Not in this order, of course)
Cloning a drive would just require you to plug both the old and new to the same machine, boot up (probably from a live image to avoid issues), running a command and waiting until it finishes. Then maybe fixing up the fstab and reinstalling the bootloader, but those are things you need to do to install the system anyways.
I think the reason you’d want to reinstall is to save time, or get a clean slate without any past config mistakes you’ve already forgotten about, which I’ve done for that very reason, especially since it was still my first, and less experienced, install.