In the context of the GP where they were actively treating a heart attack, the act of restarting the computer (let alone it never come back) in of itself seems like an issue.
I believe this update didn't restart the computer, just loaded some new data into kernel. Which didn't crash anything the previous 1000 times. A successful background update could hurt performance, but probably machines where that's considered a problem just don't run a general-purpose multitasking OS?
