This is the danger of a relatively innocuous SOP (closing down an engine for taxying) becoming more compelling than applying Airmanship based on aircraft systems knowledge. Since we don't have a sharp eyed FE anymore, it is paramount that somebody up front has the requisite systems knowledge other than the computers. Similar from a Human Factors (Aircrew) perspective to the Qantas 747 in the far east that overran the runway in a Cyclone, because the Captain did not use full flap and landed fast on a wet and windy runway, because he adhered to a company SOP designed to avoid high power settings on finals, rather than do what his experience and instinct would have told him to do.
Aviate - Navigate - Communicate, even when on the ground.