I posed this question to a hitter the other day and it seemed like he immediately saw the light.
"What good does 'getting on plane early' do for you if the pitch is a slider/cutter/changeup/split-finger/sinker/sweeper/non-fastball?"
"Getting on plane early" was popularized a few years back as a way to maximize exit velocity and bat speed.
Pitchers use a term called tunneling to make their pitches much more effective. The pitch tunnel is (from a hitter's perspective) the tunnel that the hitter sees out of the hand and to the plate. If a pitcher can create the same tunnel for 2 or more pitches, getting on plane early is playing into what makes them nasty. Fastball, Slider, Changeup are 3 pitches that, if thrown effectively, share the same tunnel but deviate off as they approach the plate. In the video below, Gerrit Cole throws 2 (FB & Slider) pitches that approach the zone in the same tunnel but end up in completely different zones on the plate.
In other words, as a hitter, you need to buy yourself time to read & recognize the pitch before deciding to swing. This is why a "short to, long through" swing concept is beneficial to the hitter that would like to make more consistent, impactful contact. The "short to" portion delays the swing decision by letting the ball travel through the tunnel. The "long through" portion gives max room for error for the barrel to hit the ball if the hitter slightly misjudges the pitch's arrival to the contact point.
Early on plane would translate to a "long to, hope for the best" swing concept. Great in the cage and when exactly right, but frustratingly inconsistent in-game, against the pitchers that hitters want to beat. The good ones.
Short2Long-->
Efficient and low risk. Hope this provides an explanation of what can make hitters more consistent. Less about mechanics and the swing, and more about the feel. The hitter finding their own unique way of hitting is often how players turn the corner and become confident. A swing that allows them to be natural and adaptable.
As a hitter, spend more time by yourself in the cage. Building trust in yourself. You'd be surprised what a little low-tech work can do.
Thanks for reading all that! (Compliments to
@BaseballIQ_App for the excellent video)