Seriously?? You call that torture? The spoiled lives we lead here in the west truly makes us not realize hard realities. I can promise you that torture is way more unpleasant than sitting in the airline seat with your nice noise cancelling headphones and watching a netflix show on an ipad. Even as a over 6 feet person I did way more unpleasant stuff in the army compared to sitting a few hours in an airplane seat.
Calm down now, it's called hyperbole. You will encounter it a lot, especially online, so don't take everything you read literally.
Also, we are talking 6 hours, not "a few". And depending on your height, seat recline, and problems with lower back pain, you can bet for some people, 6 hours unable to stand up can be quite painful. Not, "bamboo shoots under your fingernails painful" but not something anyone would want to go through.
For me, the claustrophobia of not being able to stand up would be quite terrible.
