And hence under no circumstances one should ship a code that just doesn’t do what it’s supposed to do in the first place, we know the cloud doesn’t use it much, but c’mon it’s a critical part of the system.
That still does stuff like unmounting filesystems (which can take a minute with snap, if they haven't fixed it), you can go further with the (rather unsafe) SysRq key "o", which tells the kernel to shut down without any preparation.