One of the most rewarding results as a baseball coach is when players are able to self-correct during games, whether on the mound or in the course of an at-bat. This can only happen with hands-on teaching and constant reminders on what can make the player have success. When players do execute, it tells the coach that the players have listened and have tried to incorporate the techniques that the coach believes will maximize their talent.
Not every coach follows that modus operandi. There are a multitude of system or philosophy-driven coaches. If players don't fit in to a system they will usually underperform or be eliminated from the program. Only teaching one philosophy is a disservice to players, who might not fit in depending on skill and size. With coaches who know how to teach only one system, it is their way or no way.
Coaches who have taught and understand multiple methods to improve player skills are more preferred and appreciated within the coaching profession. It expands their teams' talent base and, as a byproduct, improves their team's chances of winning.
Generally coaches with the most expertise are the most successful. They have other options when some strategies don't work. On the other hand, system coaches get beat when opposing coaches figure out how to attack their system, leaving system coaches without any alternatives.
Coaches who work with each player on their team form relationships and can get players to self-correct if the coach has excelled as a communicator. For example, a pitcher has thrown two balls up and in to a hitter. The coach signals to the pitcher what he is doing incorrectly or yells to him a key from what they have been doing in bullpen sessions to get him back on track, and immediately the pitcher makes a correction. Or after a hitter fouls balls off to the opposite field. If that was perceived to be a problem and the hitter has reverted back to his previous form, one keyword or signal can activate the correct technique within the hitter. The hitter steps out, gets his head together, and executes his right swing.
Watching players adjust during games is one of the most gratifying aspects of coaching. It feels like you are getting your message across and doing your job, making players play at the best of their abilities.