People have lost the joy of living
By default, you should keep the window shades of the plane open so your row-mates can see out the window and the miracle of human flight. People can request it closed if they want to nap and it can be lowered if the glare is intense, but otherwise, if you close it, you are ignoring how cool it is to look out of the window in an airplane. Window seat controls the shade and gets the outer armrest, middle gets both inner armrests, and the aisle gets the aisle armrest and a little extra legroom. With that said, some people are jet lagged or want some extra rest, so they close the window; the wall is nice to rest on. Some may not have actively chosen a window seat and don’t like flying/get motion sickness, so they close the window. And those who can’t be separated from their phones for more than 10 seconds, so they close the window to block the glare on their device or seatback TV. Others buy window seats for the sole purpose of looking outside. That’s the point of flying, otherwise I could...