Five Boeing types and it's always been in the manual. Just piss-poor systems knowledge and assuming instead of checking. Boeing is certainly not to blame in this matter; the culpability lays firmly with the pilots.
I can't abide these ambulance-chasing scum; they're screwing up the world for the rest of us with all the nanny state, we-know-better rules we have foisted upon us because of greedy people and greedy lawyers.