You see, in the end, everyone expects the appraiser to be fully knowledgeable with respect to valuation - at least to the extent that valuation accuracy is "reasonable" - yet organizations, such as TAF and the AI, really take rather little responsibility for education and credentialing on these issues, nor is anyone paying appraisers for the time they need to become proficient or do a satisfactory job on assignments. The system does not care - as long as the appraiser and they themselves can get away with anything less. As with every profession, it is a grey area.
You can complain about how imperfect it is, as much as you want, but the system of Lenders, Banks, Agents, Enforcement, Homeowners, etc., is large, almost immoveable, and in any case laden with so much inertia, that trying to force change is an excruciatingly painful and prohibitively expensive experience.
In the end, it is up to appraisers to set their own standards, their own fees - and just make sure every other appraiser who gets in their way is clobbered as much as possible.
Be ruthless.
Be relentless.
Be hostile.
Kill or be killed.
It works both ways of course.
The whole troop on the Miller Case was completely incompetent and undeserving of any kind of sympathy. That is my take. It was a big Cluster****.