Originally I came from an internal Chinese martial art background which usually focuses on relaxation, rooting, structure, sensitivity and etc. Either way Internal arts tend to focus a lot on relaxation to the point of shunning any tension. Powerlifting has always interested me and I started learning about other sports. Through my research I find tension to be very useful, tension is needed to abdominally brace yourself when you try to squat heavy amounts. Powerlifting also has a focus on compound movements like whole body power generation like internal arts. The quads/glutes work as the power generator for the body for both powerlifting and internal arts and use a stable base (the ground) to push off against. I think Internal arts are correct in trying to restrict unnessecary tension, discouraging people to do isolated movements, and trying to establish fluidity in technique but in my opinion force comes from tension which is a good thing but you need to know how to use it correctly.