I gotta agree with you..I' m not concerned about a few feet pre second. Sometimes, on some bows, the differencee between a 14 and 16 strand string equates to an increased amount of noise. This concerns me more than speed.
I tried a 16 strand string out of artificial sinew(the thickest of the three types) a couple years ago and I' d guess it slowed my bow down by about 80 fps

..That' s a bit much I thought.
We make choices as to what we personally want to get/accomplish out of our bowhunting. That decision dictates " how" we hunt and for many the " how" is the most important factor.
Good hunting