Is it weird that we don't have a way to update the system without rebooting by this day and age?

I think there are things in Linux like live kernel patching (kexec, ksplice), but why by 2026 is this sort of architecture of live system updates not a common or included feature yet?

People hate updates and having to reboot and have downtime right? Security updates to core systems are more important than ever now too. So why hasn't this problem been tackled I wonder?

Wouldn't it be great if our systems could update without us having to reboot and interrupt our workloads?