Windows required to be open during takeoff?
I flew today from Korea to China. Chinese airline. Airport in Korea is dual military/civilian so photos aren't allowed. Flight attendants were making sure every window in the cabin was closed, and the window could not be open until we reached cruising altitude.
This seemed very odd to me. I understand why they did it, because they stated they wanted to prevent pictures of the military airfield. But isn't it unsafe to take off with the windows shut? Usually when I fly in the US or Europe (even in other Asian countries), the FAs make sure the windows are open so in the case of emergency, your eyes are acclimated to the outside lighting. This is especially important at night, I would imagine.
Am I overreacting for thinking this is very odd and unsafe when it comes to safety standards? Just seems to counterintuitive to airplane safety.
Edit: I've flown domestically in Korea from a dual use airport and wasn't required to do this, so is it a thing just for international carriers?