Which action is explicitly prohibited for COACHES during gameplay?

The action of touching the controls of the ROBOT during gameplay is explicitly prohibited for coaches because it ensures that only the drivers are in control of the robot once the match has started. This rule is in place to maintain the integrity of the competition and ensure that the game remains fair, allowing the drivers to demonstrate their skills without direct interference from coaches. By restricting coaches from physically interacting with the robot's controls, the rules promote a clear distinction between the roles of coaches and drivers, keeping the responsibility of operating the robot solely on the drivers.

The other actions, such as giving directions to drivers, strategizing with the drive team, and communicating with the audience, may have specific guidelines but do not carry the same level of prohibition as touching the controls. Thus, the focus on keeping the drivers solely in control during the match underscores the importance of this rule.