I used to have a very good coach when I was a junior who used a lot of the things from Inner Game. He was one of those coaches that wouldn't talk all the time, but when he said something you listened and it was always dead on, to the point and he knew exactly what he was doing. All the top juniors in the area and outside as well would take lessons from him.
I like the Inner Game approach and have used it quite a bit in my own teaching but it cannot be applied all the time. For example, I worked at Newks as an academy coach and there they want you to be verbal and loud and motivate the kids, constantly. Parents are watching so they want it to look like theres instruction given all the time.
In 2006 I was teaching at an academy in Germany that had quite a bit of good ITF junior players and I remember one incident where I had 3 players on my court working on a backhand drill, I got them to do the drill right and they were working hard, so no need to blab on every ball. I said something maybe once every 5 balls or so such as encouragement and a correction if needed, which could still be considered a lot for Inner Game type of coaching. Anyways the head coach came over, gave me a look as if to say WTF are you doing? and then took me aside and said I need to be loud and give constant feedback, pretty much on every ball hit.
For me as I player, I never liked coaches who talked a lot.