Core Training & Recruiting Type II Fibers

I remember a while ago hearing or reading that Poliquin had restricted (though not abandoned) using swiss balls and other such stabilization-type exercises because he was finding that it was often negatively affecting the strength and power of his athletes. I have recently been studying for the NASM CPT exam and as part of their program they advocate a lot of these core type exercises regardless of your goals. The rational they claim is that this is preparing the body for better muscle fiber recruitment-- basically training the nervous system. What I don’t understand is this: in programs where hypertrophy and/or strength is the promary goal, I thought that Type II fibers were mainly recruited as a result of high force production ie lifting heavy weights, lifting explosively, or lifting to failure with longer TUT. (per Waterbury’s excellent quiz). With the trend towards all this stabilization stuff, it seems like you would be minimizing recruitment of Type II fibers and hitting the Type I’s a lot more strongly. How does training your nervous system to recruit a high % of Type I fibers better prepare a person for gains in hypertrophy and or strength workouts if you aren’t even firing up many of those Type II fibers?? Phyisology gurus??