New 2022 model F150 lightning has independent rear suspension (coil springs), which unlike raptor, will be a mainstream model for everyone.
Current 2021 Ram 1500
2022 Toyota Tundra
Honda Ridgeline
All coil springs.
F450 is a class 4 1-ton truck in the U.S. meant for heavy hauling and towing. Why would they compromise on its load capacity by replacing leaf springs with coil springs? If someone wants more creature comfort and doesn't want that much towing capacity, he/she can have the f150.