Philosophy behind wiring rule C6...

[CBP at BAE]

I've searched the forum looking for a reason for rule C6 (below, for reference). I am puzzled by the need for the 10AWG wire to connect the controller to the device, regardless of the fact that the device may well have a smaller gauge wire to connect to (Globe motor comes immediately to mind). Why? Surely manufacturers of products that use these motors don't run excessively large conductors from the power source to the device. Or do they?

"C6 You must use 10 AWG or larger diameter wire for connections to and from the Speed Controllers if they are used with the Drill, CIM, Fisher-Price, Globe or Van Door motors. Even though the wires that are factory attached to these motors may be of a smaller size, the connection from the motor wires to the speed controllers must be as stated above."