> Do you feel this strongly about being able to replace the engine in your car with one you made yourself?

I am not one of those people, as I do not do cars, but I would hazard a guess that most car people over a certain age do in fact feel very strongly about what modern cars have become. The ones who grew up without knowing what ownership feels like less so, which reflects the exact same dynamic with younger generations who are growing up without ever knowing what it feels like to own the hardware they use.