I ABSOLUTELY deny that I've EVER recommended anyone 'guess' at anything. That, my friend, is what is ludicrous.
It was an actual study - I think done by the St. Louis FED (although I can't find the study now). Here's another one to peruse in it's absence, though:
While that is true, they are also 'alternative valuation methods' when comparing them against the SCA. Hybrid appraisals and AVM's are also alternative valuation methods as compared to traditional appraisals. Not sure why that is such a difficult concept to grasp?
You really don't understand what a valuation is, do you? You state that a BPO is a 'price opinion', but in reality, it's a broker's estimation of the worth of a particular real property right (or bundle thereof). As is an AVM.
Look - you don't like the fact that the GSE's 'sped up the process' in light of their opinion that 'traditional valuations' were/are lacking. An opinion that has been demonstrated to be (in general) VERY accurate. Don't blame the messenger.