I know nothing about bike fit or kinesiology. There is so much info out there on the "correct" setup. When I first started KOPS was the basic starting point and I pretty much used that as a guide. But it has been so long that now I just use the setup from one bike as the starting point on another.
But I do know that, at least for me, there is not a single point on the saddle for all my riding. I have no idea the amount of movement, but I know that I am seated slightly more forward when I'm spinning out in the drops, and slightly further back when I'm grinding up a hill. I suspect it has to do with less extension needed for spinning and more extension, leverage, for grinding.
I tend to error on the saddle further back, than further forward. At 68 and decades of riding, I feel blessed to be able to ride relatively pain free.
John