Not all positions are created equal. While we may not think about this on an everyday conversational basis, we know it to be true. In fact, this simple truth is already embedded into sabermetrics like WAR and defensive runs saved with positional adjustments.
Shortstops, catchers and center fielders provide the most defensive value. First basemen provide the least. Well except, for the designated hitter.
We know the DH is unique in that it completely takes defense out of the equation. However, the spot has a stigma attached that isn’t entirely accurate. We normally think of an aging, slower slugger occupying the position, which leads to an incorrect notion that that player contributes bad defense to the team.