There’s a very legitimate and frightening reason for planes to dim their lights at takeoff and landing. The idea behind the dimming lights is to give passengers time to adjust their eyes to the lighting outside. But why would that be necessary?
Well, in the event of an emergency situation your eyes would need time to adjust to the darkness outside, but if they dim the lights you’ll already be adjusted to see your surroundings and respond accordingly. If you need to escape, it’ll be easier to see where you’re going and quicker to get there if you don’t have to waste time stumbling around as your eyes readjust. Without the safety precaution of dimming the lights, a chaotic situation can end up being much more disorderly and inefficient.