What annoys me when passengering is to arrive somewhere, then as soon as the brakes go on the packs go off and within a minute it’s a sweaty hell down the back while you’re waiting for the jetty/steps/doors, etc. This totally negates any efforts from the airline before or during the flight to make your journey more comfortable as you have to drag your bags through a warm airport in wet clothes.
Duty of care overrides any airport requirements. I make an effort to comply with most things but if they seriously affect comfort/safety then they get ignored, like a couple of aircraft running their APUs is going to make a difference when there are 20 aircraft waiting to take off and another 10 waiting for a stand, all with engines running.