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Microsoft wants to update your Windows 11 PC without forcing you to reboot
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
Linux only needs a reboot if you want to update the kernel, normally.
but in that case you can often kexec to restart linux faster, skipping the actual BIOS/UEFI boot.
also, some distros offer live patching of kernel code for $$$
You don't need to pay money for live patching.
They really just make you pay for having them do it for you.
I think you forgot to mention what distro you are running.
PotatOS btw.
Eh, it depends. Other low-level things (systemd, glibc, etc) need a reboot too.
Technically, but it's safer to reboot nonetheless: https://fedoramagazine.org/offline-updates-and-fedora-35/