Volunteer Coach: Making forward strides amid avalanche of swing advice

Is there any movement in all of sports discussed, analyzed and debated more than a baseball swing?

Do I swing down on the ball? Or up? High-leg kick like Donaldson? Or no stride like Molitor?

Back elbow up or down? One-hand finish or two?

Is hitting rotational or linear? What’s more important: my hands or my hips?