Like you, I am part of the older fan base and will turn 76 shortly. I also was an engineering manager and chief engineer for a very large corporation, finally retiring only about 6 years ago. My wife was a math professor and taught statistics, so we both can appreciate data and its use as a tool in evaluation. I also appreciate the human factors which are part of a team experience and a manager like Tony LaRussa expressed many of those thoughts the recent book he participated in. I still play senior softball year round and know too well that one experiences ups and downs in performance. Sometimes it is difficult to understand but it happens even to those of us with vast experience.
My opinion is that building a team solely based upon Sabermetrics would to foolhardy as would ignoring that data developed over many years. The smart approach is to use human factors and acquired data holistically and a major league BB team should select it's staff so they can handle both, realizing that no choice will achieve perfection.