Been getting final load sheet after departure for 25 yrs. Company wide it's thousands of flights per day x decades. Update the FMC/numbers if required. Stop the a/c if required.
Mgt pilot displayed me on a leg. Gave the FO, a former Captain, a briefing on the taxi route that the FO had done hundreds of times. Day VFR. Not required per SOP. Painful.
Heads down is safe in places. In other places it absolutely isn't safe. The amount of time where it is safe to go head down varies. Know the difference and act/perform accordingly.