Precisely. It does depend on an individual's build, but for me premium economy (38" pitch, 18.5"+ width) is the minimum space I would consider for a flight longer than about 90 minutes. I am particularly bothered by the lack of shoulder space in narrower seats, but then I'm also the guy who always wants to sit on the aisle at the ballet. (I would also be happy to see all in-flight entertainment hardware removed from aircraft because I resent the lost space beneath the seat in front.)