Trackman encourages an external focus of attention – directing your attention towards club and ball impact and away from the 70 swing movements themselves. Lots of scientific research supports this way of learning.
Trackman encourages self-organization of movements – We are all built differently and swing the club differently for a number of reasons. This is why there are so many distinctive styles of golf swings on tour. Rather than getting fit/taught into a swing, this encouraged freedom of expression creates the impact you desire in whatever way you find fit.
Quality feedback – to heighten learning, it is important to have good feedback. While video helps, it tends to promote an overly internal focus. Trackman is keeping the focus external and relevant to performance.
Self-discovery – I used it (and use it) to explore variants of movement. I can try out-to-in swings and in-to-out swings with variable open and closed club faces like never before. I can use this data to prepare for tournaments and weekend golf.
Uncontrolled manifold hypothesis – with a focus on the task of achieving a desired impact, your brain uses all of the degrees of freedom (knees, hips, shoulders, wrists, elbows etc) in perfect harmony, working together beautifully to create it – given the right feedback.
Perceptual adaptation – Trackman helps to bridge the gap between feel and real. This is usually a big road block for most golfers changing or adjusting their swing. This is where perception of what you are doing and your action is completely different.
Creating pressure – 'Trackman Combine' is a game where you hit varying shots and get a score for each shot. At the end, your overall score is graded against others around the world. This creates a level of competition in practice. You are competing against yourself (trying to create your own personal records) as well as others around the world. As you are approaching a good score, you get really nervous.