I think when they started manufacturing multifilaments to immitate natural gut, there were probably some other chemists and structural engineers who were like, let’s go in the OPPOSITE direction. Why? Why not! In these modern tennis times of spin/polyester/RPMS I think it finally makes sense. Racquets are so powerful now to compensate for the low powered polyesters, you can no long throw a gut-like powerful string in there. It turns into a rocket launcher. So they’ve come up with low powered multifilaments to complement the current string market so nicely.