Very like our cars in fact. Nobody can work on them except highly-trained, expensive technicians, and you have to replace entire assemblies when they break, rather than fixing them, and these assemblies are very expensive. My first camera was a Pentax Spotmatic in 1975. Very simple, very mechanical, easily repairable. My first car in the late 1960's was very mechanical too. Most things, I could fix myself. No computers, no electronics except the AM radio. Today, it's very much the same with cars as it is with the electronic cameras, let alone digital (what a nightmare those must be if something goes wrong).