One of the problems with “old school” instruction (it’s trying to make a comeback: just ask Brandel Chamblee) is that the things it relies on, i.e. the sound of the strike and the ball flight, are subjective when it comes to ascertaining what produced them. Trackman has shown that our conventional ideas about why a ball flies the way it does are incorrect. We can’t rely on just the ball flight to tell us what went on during the swing. We need video for sure, as there is no substitute for visually analyzing a swing, and a launch monitor is another great tool. I don’t trust my “eye” to properly analyze a swing at full speed. The truth is, the swing is too fast to decipher without being able to slow it down and take time to go over it in detail. The people who think that “modern instruction” is horrible for golf are simply mired in the past and desperate to make golf “easy”. It isn’t, and anyone who avoids the very things that would provide additional help in truly figuring out why the ball won’t go where you want it to is, in my eyes, a lesser teacher for it.