I run a Proxmox homelab. I just had to shut everything it runs down to upgrade Proxmox. If I could hot rreload the kernel, I would not have had to do that. Sounds pretty handy to me. But that may be the multikernel approach, not this partitioning.

Honestly, even on the desktop. On distros like Arch or Chimera Linux, the kernel is getting updated all the time. It would be great to avoid restarts there too.