I agree. To me, proper diagnosis and repair is FUN. I remember in high school auto shop, there were trouble shooting "trees" that we all learned and memorized. You started at the top and made your way down until you found the trouble.
Well it's fun if it's in your driveway or garage or your friends car , but on the side of the road or when your busy doing something and the wife calls you..." car won't start " and she's out shopping or at work or something, then not so much....