Originally Posted by Lord Spandex
Even if the entire length of a wing, swept or straight, stalls at the same time the separation of the airflow occurs towards the rear of the wing causing the centre of lift to move forward. Unchecked that may cause pitch up.
The purpose of washout (look at the outboard 1/4 of a 747 wing from the rear) is to prevent this entire-wing-stall-at-the-same-time. The entire wing won't stall "at the same time", surely?