Many youth baseball players have "good enough" hand eye coordination to get away with incorrect hitting mechanics and have early success because of that. However, those incorrect swing mechanics become tough to change habits down the road, leading to short baseball careers.
Tuesday Tips to Tattoo the Ball
Hitting Mechanics Drills for Correct Swing Development
Having taught hitting for 24 years now, I realize that teaching players to "load "the bat into ready position is very difficult.