The reason for banning electronic devices during take-off and landing is because of EM interference, not because of distraction. If you want to ban distraction

The reason for banning electronic devices during take-off and landing is because of EM interference, not because of distraction. If you want to ban distractions you need to ban books, sudoku, and noisy kids too, the electronic bit is immaterial. Also people are already free to use devices during loading and unloading. Your complaint is that people don't have common courtesy, but that can't be regulated by FAA (and isn't currently)