I like your perspective, as well as some of the points other commentors have made in response to your own. However, there is one point you make that I disagree

I like your perspective, as well as some of the points other commentors have made in response to your own. However, there is one point you make that I disagree/question - is a physical skill and grace not also a form of knowing? The human body and brain are intrinsically connected "machines" (not a term/concept I love, but for want of a better one...) and so their knowing and learning must surely be tied together. But, larger than this yet so interconnected - is this aspect of our being not also where we experience our first limitations? And if so, then wouldn't that imply limitations to our purely cognitive experience? For example: I can swim (a physical skill), but due to pure bodily limitations (height, arm/leg span, etc.) will never be an Olympian (a physical achievement). Surely, you and I could be taught how to and practice as we would attempt to learn, but still likely never achieve the grace of a ballerina, possibly regardless of the age at which we begin. And so - how is it that this "failure"/limitation could not also be applied to the cognitive? Isn't also likely that our own intelligence could have similar limitations that we perhaps aren't even aware of, for how would we measure? Again, just positing some questions your comment brought to mind; in particular, I appreciate the idea of the depth of mental "stack" being the quality of measurement that matters in differentiating intelligence levels. And so now: to find the physical stack, which in this case is both metaphorical and real (for the weight lifters out there, anyway).