I think that the other issue is the culture around(and design) *nix and BSD systems, where a reboot is generally only done when very bad things happen to the sy

I think that the other issue is the culture around(and design) *nix and BSD systems, where a reboot is generally only done when very bad things happen to the system, and nothing else can correct it. Often, there are a lot of other things going on that prevent the system from gracefully rebooting. So hardware vendors might test a "standard" reboot, where nothing is broken, and the OS is in a stable state. Unfortunately, that probably isn't the case where most required reboots occur.