I think it is more along the lines of different vendors making the parts the way they want. Ford allows a certain bit of changeup in the basic design blueprints if it does not materially change the part. Half the time it's just to keep the engineers gainfully employed while they figure out new ways to screw us.
Take that resistor. In all other places the cooling electrics plug in the plug-in terminal size is much bigger than right at the resistor block itself. The jack-ss over that design was asleep at the wheel. The connector is too small in cross-sectional area to pass the power that goes through it, it then melts.
Fix the driver first, then fixing the car becomes so much easier..........