...IME when trying to maximize the effectiveness of a multi-pitcher and two-catcher rotation, the better catcher usually gets paired with the wilder/more difficult to catch pitchers so the metrics can be misleading
Yes, but when the strike ratio is 10% higher across all pitchers with Catcher A versus Catcher B, it is obvious what is happening or not happening.
FWIW - The same metric is applicable to umpires.