Sad but not surprising. The poor homeowner is getting ripped off every day. This one had the benefit of your knowledge. But how many don't even know they've been had?
Some 30 years ago, when aluminum siding was the "in thing," I witnessed a laborer setting up scafolding for siding installation drive a 3-1/2 nail trough a 2"x10" then right into the beautiful clear cedar window sill. When I asked what he was doing, he said "I do that all the time. Plastic wood will hide the hole."
The sad part is that this sort of thing happens with all the trades. Unfortunately, even some plumbers don't take pride in their work. I can't remember how many times I've seen them notch a whole series of studs half way through... and more. Thank God the kitchen cabinets held the wall together.
IMHO, whatever the trade, profession or calling, street-sweeper or Mother Theresa, some people find reward and satisfaction in the the work they do. Alas, others, burn burgers one day, botch up counter tops the next, then move on wondering why they are never satisfied.
Keep the spirit