This topic is right in my wheelhouse. I rode Apex's for 6 yrs. They had all the light weight stuff....Almost 100 lbs removed, also had Boost. Then I bought a 12 Pro RMK, and have now ridding a 12,14,16 and soon to be 17 rmk. The 2-stroke, right out of the box was 150lbs lighter then my "lightened" apex.
On the Apex, you work your butt off! If your riding technical stuff all day....by 2:00 your shoulders are begging to be done for the day. It needs to be fresh powder so you can drive it with the throttle. If its spring conditions its not even worth unloading.
The RMK is so much easier to ride, It requires so much less input from the rider. Not to mention the chassis just works so much better that you dont need 240 hp to climb the same hills.
No reason to fight technology. Eric