If there is a critical security vulnerability that must be fixed as soon as possible, but you
have jobs running that you'd prefer not to kill, then it might be worth using such a tool
(assuming it doesn't risk causing corruption).
In the best case, things run smoothly and the vulnerability is patched. You can then perform
the reboot at your leisure. If things don't work out, you can reboot into the new kernel as
you would have done previously.