What do you mean spring on shock?The assault is a different animal. No coupling yet a very traditional 90s-2000's rear shock geometry. Spring on the shock. That's not all bad but it is given the geometry of this arrangement.
This rear suspension was: cost
reduction+weight target+make it good enough for it's intended purpose. It's not really a "trail" sled. It's made to get you to illegal off trail riding and to assault your spine on the trails back. Mission accomplished.