"That 1.5″ number is for single rear-wheel vehicles, while the dual-rear wheelers are lowered by about an inch, according to the Ford engineer."
“IMO, the benefits are obvious. Handling, fuel mileage, cargo floor load height, more level towing of fifth wheel trailer, easier to get in and out of. What is the benefit of raising a truck outside of ‘it looks cool?’ Maybe if you are a serious off-roader? But who would pick a Super Duty for that?”
Makes sense to me, but it may not look as aesthetically pleasing. I guess Ford is going more for function over form.
https://www.ford-trucks.com/articles/did-ford-secretly-lower-the-2020-super-dutys-ride-height/