This is such an outstanding post/question. Here’s my take on it.
I’m going to use myself as an example, in addition to observations that I’ve made over the years. I’m not going to address amateur baseball to answer your question. I have little experience in this area.
When I started out in the mid 70’s, I was called an Associate Coach – short for a goffer, go-for-this-go-for-that. The man that I reported to was the Pitching Coach. I followed his lead at every turn, without exception. So, in effect I was a carbon copy of man of his generation, his training (or lack thereof), his way of doing things. As time went on, I notice other clubs did things differently – a lot different. So, without delay, I’d ask why, how come, what’s with that?
What I found was, every single pitching coach was a carbon copy of who their mentors were. In every case, all mentors were stuck in time, comfortable with what they had and how they did things – after all it worked, don’t mess with it.
But hold on here, how come so much difference, but with positive results? The reason being these people (coaches) were dealing with mature adults, little if any learning curves, physically matured bodies, and no distractions like the amateur player has. So, from one club to the next I found variations with the same basic formula, but not a reinvention of the total package. Now let’s not forget, the coaching staff and their charges are doing this stuff over and over again, day in and day out. I mean, even a monkey can get 90% of this stuff if he’s pointed in the right direction over and over again.
Now let’s fast forward to the armature game. We will not find the same temperament of staff coaches, nor will we find the resources. What we will find is an amateur playing pool that has, to a high degree, a take-it-or-leave mindset, parental and social influences that can be major distractions, and so on.
So how can a training method slip in between the cracks- by inventing a product that compliments the environment that the amateur has to deal with – NOT THE TECHINIQUES OF DEVELPOING A PLAYING POOL OF A WIDE VARIATION IN MATURITY, ABILITY AND DEISRE. The basic mistake that all these people make is to approach an amateur with a cookie-cutter technique, OR, a personal style and technique that “they” think will work based on “their” understanding.
If there’s one thing that comes to mind to address your question it’s - INVENTIVE. The promises, the projections and all the hoopla that orbits amateur coaching should be expected. Again, I think the word INVENTIVE pretty much sums thing up. Then let’s throw in a dash of volunteers who have their hearts in the right place, but their experience with stuff (techniques) is as current as the last “how to” video they just rented.
There are pitching coaches out there that make an honest effort to learn the current topics of the day and try very hard to put the speculative into practice.
Pitching is a very personal thing. Pither’s come in all sizes and abilities. Their signature product can vary from pitcher to pitcher. So, training a pitcher correcting bad habits, bringing a man back into form during rehab means detail, customizing the coaching to fit the unique individual, and so on.
I’m sure others can offer a much better take on your question, but these are my observations on the topic.