We are very proud of our empirical focus, because it makes us humble - we realize that most of the time, we don't know up-front what customers want. The feedback from testing quickly sets us straight, and helps make sure that our efforts are really focused at optimizing the things that make a difference in the customer experience
Neil Hunt, Chief Product Officer, NetflixThe rest of the response to the question
"What types of things does Netflix A/B test aside from member sign-up?" is well worth the quick read.