Because it’s a cramped space. People who get up when the plane touches ground are going to be standing in the walkway with their bags and butts pressed against other people for all the time it takes for the plane to taxi in and connect the doors to the terminal or stairs.

They do not get out faster.

You had the entire flight to walk to the pisser and back to your seat for as many times as you wish, but now , exactly at the last and most annoying moment, you absolutely can’t sit down for 5 fucking minutes? The door will open at the same time.

Just stay seated. You’re going to wait for the luggage anyway.