Pitch-framing numbers answered questions we didn’t know we had. A new statistical category emerged out of nowhere, and before long, the research proved its own worth. That was the birth of the revolution. Every team now wants good-receiving catchers. Every team, additionally, wants to develop more good-receiving catchers. The market is going to end up flooded with good-receiving catchers. By then we’ll no longer recognize them as good-receiving catchers. Pitch-framing is sufficiently important that baseball teams will prioritize it right into insignificance.
A terrific piece on the history of pitch framing by Jeff Sullivan.