@pamac, I don't really have an issue with experienced APPs practicing independently, especially on well-chosen patients and in "safer" chronic specialties (although I am way too picky to accept their care for my family - that also applies to many physicians). I understand that there is a physician shortage in certain parts of the country, and that everywhere hospitals are way too greedy, so they try to cut even that 7-8% which is the real cost of the physician in the hospital bill. I also know that the ship has sailed, and pushing against this agenda will make me unemployed pretty fast, so I try to find an ethical and practical way to live with my employer's agenda.
I do have an issue with young inexperienced APPs practicing unsupervised (some nursing schools are downright diploma mills when compared to any American medical school, no offense - online/"hybrid" healthcare degree, seriously?, that should be an oxymoron). I also prefer not to practice alongside independent APPs in a "collaborative" model. If they want to be "independent", I won't be their firefighter who fixes their mistakes and near misses, or who takes care only of the sicker and more stressful patients (aka pick and choose).
Quality should speak for itself, indeed. Unfortunately, the average person has an IQ of about 100 (which is pretty unimpressive) or worse, and that's about 50% of the population. One third of the population has an IQ of under 84-85, which is so low that even the US military would refuse them. These people are one of the reasons why American malpractice laws are paternalistic (e.g. one cannot sign away one's right to sue for malpractice, the physician is responsible for offering only treatments within the standard of care, regardless of the patient's wishes etc.). They need to be protected from themselves, unless we let natural selection follow its course (which I personally don't disagree with, but the politically correct do - for example, we prevent alcohol withdrawal in chronic alcoholics with sedatives, instead of IV ethanol or PO alcoholic drinks).
Also, because the average person doesn't really have the analytic equipment to notice the difference in outcomes, many physicians are rightly concerned that they will lose patients, even if their care/knowledge is obviously superior. Most people are not intelligent enough to make purely rational decisions; they are mostly emotional beings, hence the postmodern concept of emotional "intelligence" (so that dumb people, who can't think logically - which is what the IQ test measures - won't feel bad). They are the ones the "heart of a nurse" APRN ads are aimed at. These people will believe a lot of stuff they are told, even if outright lies; for example, that physicians and APPs have equivalent education, just through different pathways. The whole concept of DNP was invented to try to fool these fools: it's still a doctor, just a "nurse doctor" (ND - doesn't it sound/look like MD?). Even highly intelligent people can be dumb when about healthcare decisions (e.g. Steve Jobs). Another proof that there is a serious public health issue about independent practice.
And let's not mention that most MDs (not to speak about APPs) have no friggin' idea how to properly interpret a research paper, hence the 95+% of papers that are worthless and get contradicted sooner or later (please read Dr. John Ioannidis for exact numbers and concepts). But hey, all of them get to treat patients and establish the standard of care. Advanced mathematics should be a requirement for practicing medicine in any of its forms (says the guy with a minor in Math). But I digress...
We also live in a country which has a long history of blue-collar anti-intellectual streak (some communist proletariats would be proud) - just look at our presidents (few were intellectual powerhouses) - and that was before the age of Internet and social media, when everybody is an "expert". Hence antivaxxers, hence people not following medical advice (I had a HbA1c of 10 patient tell me that he switched from a physician's antidiabetic presciption to what his blue-collar friend advised, and he was praising the friend). In this era, the true experts disappear in the sea of quacks and Dunning-Kruger examples (the latter including many cocky APPs).
Unfortunately, most professional APRN organizations are downright disgusting in how low they have sunk pushing their independent practice agenda (which only exists because Big Healthcare has a serious financial interest in it), and many physicians see APPs as the extensions of these organizations (hence the lack of respect by default). For example, I have found that the most reasonable non-militant well-prepared experienced CRNAs I work with all hate the AANA, almost without exception (and the other way round).