The analogy runs out of steam pretty quick.

Would you prefer your heart surgeon be one who has a personal interest in the field, or one who after ten years experience felt that they had "learned enough", and that new techniques are just fashions.

Would you prefer your pilot to be one who has a personal interest and really understands the dizzying array of knobs and dials in a cockpit along with understanding how the plane works, all the checklists and procedures and things to do when something goes wrong? Or would you prefer a pilot who felt that they had learned enough and really just want to know enough to get the plane up and down in good weather conditions?

I agree with the point you are making but would still continue to pay a little extra for someone that I knew enjoyed looking after the details while they were doing plumbing (or whatever trade).

>fiery passion for plumbing or because he fixes toilets for free in his spare time.

My sides went into orbit after reading that.