I see you point but it is a little alarmist.
- Batteries are not part of the robot.
- Assembled transmissions. Technically correct. Hopefully inspectors will be rational.
- leads on motor controllers/motors are allowed while maintaining their cots status.
- Nasa machine shop /team shops would presumably working with team input: legal parts.
Without the rule being like it is... A far sited mega team could bring in 2 40 lb ramp manipulators complete with can motor controllers in their bagged allotment in addition to their 120 lb robot. Strip the 2nd pick donor bot add the ramps, connect the canbus and power to the donor bot, load new software in the RoboRio & have a ramp bot that the 3rd team had nothing to do with. Probably not GP. I am not suggesting that a team would do this.
Teams helping other teams are so ingrained in First culture I don't see this as being aimed at that.