There is precedence in the rules to allow for water breaks that do not impede the flow of the game (Officiating Handbook 5.G.b - Allow players to quickly hydrate and towel off between rallies or when there is an interruption in play that does not require their attention).

Many other sports (including MLP) allow for sideline coaching in between plays.

One argument for allowing coaching during a game is that it can enhance the learning experience for players, especially for those who are new to the sport.

Coaching during a game can provide players with immediate feedback on their performance and allow them to adjust their strategy and technique accordingly. This can help players to improve their skills and develop their understanding of the game more quickly than if they were relying solely on their own observations and analysis.

Additionally, coaching during a game can help to level the playing field between more experienced and less experienced players. If experienced players are allowed to coach others less experienced during a game, it can help to bridge the skill gap and create a more competitive and enjoyable experience for all players involved.

Furthermore, allowing coaching during a game can also create a more social and collaborative atmosphere among players. Players can work together to develop strategies and improve their gameplay, which can foster a sense of camaraderie and teamwork.

However, it's important to note that not all players may agree with allowing coaching during a game. Some may argue that it disrupts the flow of the game and takes away from the individual challenge of playing. Some may say that it also could create an unfair advantage for players who can afford a coach.

In summary, coaching during a game can provide players with a range of benefits that can help them improve their skills, develop effective strategies, and maintain a positive attitude both on and off the court.