At what point does it become unacceptable for a mentor to design/build the robot

[LH Machinist]

Back to the original point of this thread, at what point does it become unacceptable? I have read both sides of this issue and I propose an easy solution. During elimination matches...only students may touch the robot and mentors may get no closer than 5 feet away. This rule would virtually eliminate the design/build conflict, since maintainability will rely strictly with the students. If they didn't design/build it...it would almost be impossible for them to repair it.