Why are most electricians more professional and skilled than most plumbers?

I've paid significant money for three plumbers all of whom have done poor jobs requiring DIY correction. This begs the question why I needed to use the plumbers in the first place for what I now know to be fairly simple jobs. The fact that even these simple jobs were bodged - corners cut, leak hazards not managed correctly and so on - begs the question about how they would approach more complex jobs.

Most of the electricians I've used - except one in thirty years - have been methodical, rule based, emphasising safety and pride in work and have been very willing and even interested in explaining technical and regulation details to me.

Is it the case the something about plumbing training or the nature of plumbing jobs leads to it being less likely that you'll find a conscientious plumber who takes pride in their work? I'm guessing that a more rigorous approach would have to be taken to gas engineering.