It seems simple to me They have a spec on rotors and wire. spec the stator size, length and shape of the inner diameter. Spec the fasteners in the motor to eliminate the cost of aluminum screws that change the power of the motor. A locked sensor and the problem is fixed.
Three classes, Pro, Sportsman (17.5, open timing ESC, no sponsorships), Novice (17.5, Blinky, no sponsorships)