New Aluminum body F-150 to come with 2.7L Ecoboost!

Considering the demographics of the average F150 buyer, this is probably spot on.

Most F150s are not sold to people that tow, or haul large/heavy cargo. They buy the bigger trucks.

The average F150 is sold to Joe Six-Pack (as in beer) that he uses as a daily commute vehicle. Most of the rest are sold to hobby farm types that need to haul a dozen bails of hay for their critters.
Very few are sold as working vehicles.