ONLY golfers, among all sports, would engage in an argument about the importance of coaching, as well as staying current with technology.
NBA teams have shooting instructors. MLB teams have hitting instructors. MLS teams have a specific assistant for just the keepers. When you go to a PGA Tour event, if you sit a watch and the range, a large number of the pros are working with an instructor; many of the others regularly send video to their instructor. Even just using alignment sticks with the caddy behind them is a form of coaching.
And, of course, we know now that many of the Tour pros are spending 5 figures for their own personal, portable Trackman unit. Almost every MLB team is now using Trackman to assess spin rates of their pitchers because they've learned that a 90 mph fastball that spins more is more effective than a 90 mph fastball that spins less.
None of this means that teachers and coaches in the past that didn't have these tools were poor teachers. Red Auerbach didn't use video because the capability didn't exist during his career. Claude Harmon didn't use Trackman for the same reason. But I suspect that both of those gentlemen would have stayed on the front of the wave with technology, simply because they valued results.
EVERY professional team in every major sport in this country has a video coordinator, as do almost all major college basketball and football teams. The video coordinator is going to send the head coach a file of the next opponent on offense, and a separate file of the next opponent on defense, along with the standard on paper scouting report. It's a better way to do things, or they wouldn't be doing it.
ONLY golfers would claim otherwise. ONLY golfers would say that they can progress as quickly without coaching as with it. ONLY golfers would say that a teacher who has not stayed current with available technology is doing the best job possible for the student.
If you respond to this by saying that there are incompetent teachers or club fitters who use video and Trackman, you're just knocking down a straw man. An incompetent teacher or club fitter is a completely separate issue. The same if you say that ANYBODY is saying that coaching and lessons in the past, without those technologies, were bad lessons; nobody is saying anything of the sort. That something was the best available at the time doesn't speak to what is the best available thing now.