Its true, well a tennis coach should be the boss. However it seems there is a trend that has been developing for a while.... Parents, players and other influences who apparently know better are controlling what happens, on and off the court. In my opinion it is wrong. I can see the problem here coming from two areas.
1. The coach is not strong enough with their players and their support team or they run their business just for profits, not results or the benefit of players and the game (they don't care as they should) so they are happy to let things be.
2. Influences around the player stepping over the boundary and giving bad advice, undermining the players team and chopping and changing things around, which is confusing and causes instability for players.
As a tennis fitness trainer, I know my role and responsibility. When I deal with Tony Roche I ask him what he needs and what I can do. Then he leaves it with me and thats that, if things need to change we communicate it and move...