Another aspect Carlos hit is that pitchers know the paradigm is to try and run pitch counts to chase pitchers, so since they know hitters have a predisposition to take the first pitch, they take more chances throwing hittable strikes- ergo pitch one is now often the best pitch of an AB. Hitters can’t just let pitchers have that free ride, they have to make them work finer on pitch one, which means they will miss more and the hitter can get ahead more. The bottom line is you can’t be so committed to any approach that you become predictable, even if the approach has a sound basis because to be predictable is to be dead.
this all reminds me a game early in JVs career when he was really cruising through his starts, always ahead in the count, and then in Baltimore one day they swung at every 1st pitch strike and beat him up pretty good because he had gotten habituated to guys taking 1st pitches and stopped throwing them with enough conviction