Perhaps I'm painting
with too broad a brush. I know that folks like you, and Larry and Debbi Gamble, and the folks at OMW, just to name a few, do really great work. It is unfair to lump every repair shop in one pot. But, that said, and I'm sure that you also know since you work in the industry, that you've probably come across all manner of improperly done shoddy and questionable work that has come through your doors for a real fix.
I realize that not everyone who owns an RV has a well rounded background in, or understanding of, the various components and systems on board their rigs and the correct ways to repair various problems that may arise. What I find irritating is that there are so many "predatory repair shops" out there who just love to take advantage of such folks.
But, on the upside, the nice thing about these forums is having a handy reference resource for those who participate, by offering up our combined talents, experience and lessons learned, which are freely available for the asking, to impart needed assistance to those members with problems or questions.