Not all airlines require the window blinds to be open for landing/takeoff. THe airline im currently with require the windows to be open ONLY if the passenger doesnt mind. But my previous airline it was a must do.
The reasoning is very simple. Should something serious occur during these times then it is easier for the passengers and crew to be situationally aware of what is taking place outside the aircraft. I worked a flight with my old airline where some ingnorant man huffed and puffed about having his window blind open for takeoff...well I tell you, he was happy he did open it when he was first to notice and therefore tell us that smoke was coming out of the engine just before the take off run!
So just remember when your sighing at a crew member asking you to do the most petty thing in the name of safety....this small thing could just save your life!!!
