And maybe answers like the one I’m about to give lead to interpretations of condescension. (But it isn’t.)
That’s not what the metrics do.
Really like any stat, they just tell you what happened. Eye testing defense is more fun because you get to watch games, but it’s very weak comparatively because - that word again - opportunities are imbalanced. A couple weeks back, some were calling Kiermaier overrated because he didn’t look like anything special for 3 games. Obviously Bradley can, will, and has had 3 game stretches where he didn’t do anything special either. Hey, if the chances are not there, we can’t judge him on the plays he doesn’t make.
I would say maybe the proper argument for defensive metrics isn’t about “who is the best defender” at position X; but rather “whose having the best season defending” position X. Or best career. Or best 3-season stretch. You get the idea.
Even hitting comps are applicable. Jorge Polanco and Josh Reddick are tied for the AL lead in batting average. Are either of these guys really the best hitter in the AL?