I know the fight you are going through e57, it’s tough to convince people that there should be a certain level of professionalism in their work.
While I think the other picture I linked to is a bit too much, it does allow some points to be made.
Ask your guys how long it would take to troubleshoot a problem in each picture. If they don't say their work would take 4-10x longer gently smack them upside the head
Another point that is often harder to get across to the guys in the trenches is the business perspective. The owner who has a friend down the street that is building his house, which electrician would he recommend? Or which picture would you put on your website/flyer to promote your work?
Like I said, I feel your pain. The attitude, it works and it was fast to install is a hard one to fight.