There is a plumber in my area that has been using galvanized ductwork supports and soldering to copper.
Everyone knows what's going to happen years down the road, it will eat a hole in that copper pipe.
I understand the ease of those over cutting a piece a wood and banging 2 or 4 nails in but that is just improper workmanship.
This same plumber is the same plumber that heats a staple to put a weep hole in a sump pump discharge to prevent air lock,
same guy who hangs a ST-12 tank perpendicular from the water line and watch nearly 40 pounds of water make it bend down when it blows,
Same guy that doesn't know how to wipe a solder joint down after completion to clean up the flux.
He does it like he knows he ain't coming back. Gives me a job but should I care? Yes
You're a professional, act like one.