CoachingMastery
Professional
Bad coach is a bad coach. Most of them just feed balls and just take money from you. Some of them make you run for your life on feeds but nobody is trying to change the basic technique. And that is stealing, I can do ball feeding with my friends.
Most nobody of coaches I've seen is willing to change technique of an adult rec player. One coach said that he will not change my technique unless I take multiple sessions each week. Gimme a break! I'm NOT a future pro athlete so I'm not ought to be willing to waste that much money.
No more of that chit with me, I've learned and developed way more by watching my own videos. "Coaches" can do their stealing stuff as much as they like, I'm not part of that.
I can see why you have the opinion about coaching if your experiences consist of taking lessons from pros who only feed but don't teach or someone that insists on you signing up for a series of lessons to get a coach to actually train you correctly. I am shocked but not too terribly surprised in some ways. I've seen a few of those pros you mentioned. However, my experience in three states is that MOST pros take a passionate approach to helping players improve. I would see what pros have attended teaching workshops and conferences. That shows they care about learning more themselves.
In your defense, we have a few pros here in this town who have never been to a tennis conference, have no books on tennis nor study tennis to any degree. But, again, they are the exception.
If you had taken lessons from me or any of the pros whom I personally know that are sincerely worth their fees, I think you would have a different perspective.
Trust me, not all pros are as you have described and have gained such distaste for!