That is not the ONLY reason.. Last 3" of compression is the internal bumpstop.. You can adjust the valving on the truck (set ride from soft to firm with 10 clicking adjustment points). Definite stops on the adjustments of ride, compression, and rebound. Instead of guessing with counting turns. From everything thing i have read, everyone i have talked to, and seen The main reason for me is that they are not and off the shelf shock adapted to fit the Raptor. They were specifically designed, built, tested, tuned for the Raptor.
There is no magic/special tuning/valving of Fox or Kings from factory. Every vendors fox and king shocks are the same. (per fox and king reps.. Company A fox/king shocks are the same as company B,C,D,E,F shocks)
I know this is going to cause a shit storm, but facts are facts..
-Greg