Some call it "phoning it in", some call it "working sustainably and avoiding burnout". It's fine to "phone it in" for the daily grind if it helps you maintain your reserves for actual emergencies. As the author point out, early Facebook instead instilled a "sense of urgency" which means everything is treated as an emergency all the time, which just means nothing is.
Plenty of those civilians are lifers with a serious sense of purpose for their work.
You get the occasional dead weight, but it's far less common than you might expect.