Love/Hate Expansion

Love is privileged and hate is marginalized.

If we look at cars for example, we find that originally they were for people who were engineers (people who could deal with the innards of the engines, for example). Then there was a period when people could tinker with the non-internal parts pretty well through customization and modifications (including kits), though people would rarely take completely apart an engine. Now cars seem to mostly work. The question is whether the tinkering stage is a required stage or can we jump over it? And if we could jump over it, should we, or will things be worse if we skip this important learning stage?