Sorry but still doesn't hold water. A user accepts risk modifying their vehicle. However, The burden of proof would be on the manufacturer to show that they modified something that had an impact on the automated systems. To my knowledge there's not a single case of an automated tractor or car due to end user modification related to the automated systems that's caused injury. So right now your argument is by and large hypothetical. John Deere and the right to repair will be the proving ground for a end user modifications of personal vehicles.