Electrical solderless or soldered connectors

I will agree that soldering has the highest conductivity, but in a vehicle it is not the best solution for a wire terminal end due to vibration. And printed circuit boards fail all the time at the soldered joints. Again one example, the Chevrolet abs module in all pickups after 2000. Common failure of soldered joints, either replace for $700 or disassemble and re-solder for a couple thousand miles, rinse and repeat.