I’m not really ignoring any aspect. I’ve look at the numbers quite in depth. Ground ball rates have the lowest of all offensive numbers in baseball outside of Ks and Pop ups by almost 50%. GB and pop outs (nearly as effective as Ks) are both repeatable skills with a significance of r = 0.85. So of course they aren’t as effective as a pop out or K pitcher which I’ve already conceded. A ground ball pitcher with a K% of around 20% is just as effective as a pitcher with a k% of 28% when you factor in efficiencies. This typically bears itself out in xFIP because it excludes ground balls while adding in fly balls and in general GB pitchers allow less fly balls.
It’s not a perfect science as logical arguments can be made against anything, but ignoring a repeatable skill, while useful in analyzing part of the whole, should never be taken as the whole. It’s not how they were intended to be used and sometimes I think people would be better off if they armed themselves with the limitations of the statistics before using the statistics( not aimed at you, just in general)