The vehicles are completely different today as we all know. We have onboard computers / modules that tune your vehicle as you drive. There is no tune-up per say any more. Ignition and fuel related parts are changed at specific intervals. We have engine management systems, transmission management systems, and even body control management systems. There are specific fluids for vehicles, no more 1 coolant fits all for example. For all the extensive technology that is used in today’s vehicles, repairing is completely different. We have basic charging systems that are not basic any more ( eg. Stop/start idle vehicles). With technology changing and is more complicated, repairs and service’s become more complicated.