Understandably, airliner pilots - particularly those operating in extremely cold climates and airports - should preheat the engine at idle for 3 minutes or more so they do not apply full thrust and subsequently take off and fly dangerously on cold or frozen oil.
one answer to a question that refferenced to a day that electric towing becomes feasible and as fast and as good as engine powered taxiing stated that electric taxiing would not work because an engine should not be immediately shut down despite supplying outside solar electric power to the aircraft for airconditioning and hydraulic functions because engines should not be shut down immediately
But why should pilots keep the aircraft's engines running and not shut down immediately post landing? How do ground support work on the aircraft when its engines are running and how do passengers disembark in places that aren't equipped with jetties? Someone made the argument for the need to keep the engines running after landing when I suggested an electric towing system that could be installed along the runway for taxiing pre and post flight to save tonnes of fuel.