The problem is that for most self-hosters, they would be working and unavailable to do a graceful shutdown in any case even if they had a UPS unless they work fully from home with 0 meetings. If they are sleeping or at work, (>70% of the day for many or most) then it is useless without graceful shutdown scripts.
I just don’t worry about it and go through the 10 minute startup and verification process if anything happens. Easier to use an uptime monitor like uptimekuma and log checker like dozzle for all of your services available locally and remotely and see if anything failed to come back up.