Sorry to be off-topic, but this is wrong, and a common misconception. You are right that exits are designed to be "plugs", and it would take someone of superhuman strength to open an exit when the plane is compressed. But if you ever have to open an overwing emergency exit (that isn't on hinges), you need to throw it OUTSIDE the plane (which is not easy). If you leave it on the seat, you will force people to crawl over it to get out.