Hmmmm.... aren't facts dependent on your particular view of reality? Remember the story of the man who wanted facts about what the inside of an orange looked like. He had two oranges and he cut one top to bottom and the other horizontal. He was quite confused, because they looked nothing alike. So, that fact was that it depends.

Glad you found a crank length that works for you and your knees.

I may have missed it, but I didn't see any discussion of physical build beyond leg length and height. Yet, my reality is that my thighs and calf muscles are much larger than most folks (even seasoned cyclists) for someone my height. Hence, the longer cranks allow me to use some of that muscle mass in ways that a shorter crank won't.