Perhaps it's the smart tradies that like a job where they can knock off at the end of the day, and not have to think about it at all until the next day? And no

Perhaps it's the smart tradies that like a job where they can knock off at the end of the day, and not have to think about it at all until the next day? And not be called in the middle of the night to fix broken stuff? That last item might not apply so well to plumbers specifically ("my shitter broke!"), but it does to most other trades. :)