It is hard to fathom unless you have seen vets in this capacity( or lack there of). I think most vets do their very best, but I have experienced these issues and quite honestly, sometimes they do not want to admit they are at a loss and you need to take your animal to another facility that has more experience.
I love facility I use for my horses, but honestly, several years back, they did have a vet that was lacking in confidence and knowledge. She is no longer with the practice. I had a mini weanling colic and she was the only vet on call. She wouldn't tube her, she wasn't thrilled about putting in an IV, I felt hopeless. the filly had to be put down after a few days. I don't know that the outcome would have been different, but I just felt like a more aggressive course of action should have been taken.
Fast forward to this year, the local sm animal vet could not accurately treat my mini aussie. She was just over a year old, severe digestive issues for several months, went from 16 lbs to 10 lbs, we were contemplating having to put her down. Took her to another vet...she has food allergies ( severe), but is slowly putting on weight and her energyis through the roof now. Their response when I asked them to transfer her records was " well, some dogs with irritable bowel issues end up looking like marathon runners, they just don't put on weight". After4 visits, they just didn't get it, she was starving to death. Same facility decided to start branching out into horses. Told our neighbor her horse's lananitis was due to thrush. Horse, has just a hint of thrush in one foot, virtually no smell or black film at all, had a cresty neck, fat pads above her eyes, was on ten acres of pasture.....I told neighbor I would guess it was related to too much lush pasture and a possible thyroid issue. Had my vet out, did bloodwork,tested for thyroid issues, and that was exactly the issue- lush diet and thyroid, no thrush.
Point being, there are some excellent vets out there. I have had the opportunity to have them care for my animals. Yes, sometimes the outcome was not good, but they were extremely proactive, then,, there are vets that need to step up and be honest when the scope of knowledge is beyond their ability to diagnose. It does an enormous disservice to them and the animals they are treating.