And then every "good engineer" who adopts this means of defining success is in part responsible for the unresponsive UIs and spotty battery lives of devices run

And then every "good engineer" who adopts this means of defining success is in part responsible for the unresponsive UIs and spotty battery lives of devices running anything other than stock software. "Why is my phone running so hot and always in need of charging halfway through the day?" Well, 5% CPU here, a battery-draining busy loop there... But the solutions solved the minimal target; so suck it up, end-user.