And?
We already rely on very incomplete/imperfect information about the subject. The inspections that appraiser do are limited to those things readily observable. We are not responsible for things hidden or unapparent. Radon. Hidden structural issues. Mold inside of walls. The list of things that could be in a home that we do not currently inspect/test for is endless. Yet, we have accepted that for years, and we are comfortable with it because "that's how we gave always done it." Relying on third party data for relevant characteristics is fundamentally no different. It is just contrary to "but we have always done it this way" thinking.
Add to that, the data sources we use regularly have errors in them. Ever seen a tax card with the wrong year built? I have seen them that weren't even close. Just this past week I had a report where the subject's site size was reported to be 7 acres (odd shaped curved lot). That is what the tax card and online GIS data said. That was what was used in the appraisal report. Uh oh, survey shows its actually only 4.5 acres. OMG !! How much trouble is the appraiser in? Answer: None.
We can go back and forth forever lol....on a subject we are mold or radon inspectors so what? Yes, we rely on assumptions/ other data but the purpose of inspection is how observable conditin etc effects value, not what kind of mold spores might be beneath the soil.
The difference is, when I inspect, i own the results, when someone else inspects, I own "their" results. If it's an exterior drive by, there is (usually ) minimal or no difference if a third party does it vs the appraiser .(unless conclusion about area or ext influences matters )
But there could be greater differences between what I conclude in interior inspections.both in individual items and then holistic impression of the property as a whole,vs someone else.Appraiser will also miss out on asking questions to RE agent or owner or builder on site.
The fact that a tax cards or comps can have data errors....is straw argument. A tax card error usually does not drive results of the entire appraisal, but conclusions from an interior inspection can.
Still not addressed is possible abuse of this process... what is to stop appraisers from vastly expanding their geo areas for desk work? When fee becomes a component, will a client choose Joe 6 counties ( he only know 2 well ), will client choose Jim who limits his desk top work to the 2 counties he knows well, if Jim charges more than Joe? Will staff appraisers be told by employers now they need to expand the area they do desk analysis on ? If one inspector charges $75 per / takes detailed notes with good observation skills, and another inspector takes short notes/s mediocre observation skills but charges $50, which inspector will a client whose business is run off profiting from appraisal work choose ? The results will be compounded with these products.
How much will pressure for tighter deadlines/turn time affect racing around and appraisers having less time to verify and research?
Fannie's pilot program may not see the real world conditions of low pay/fast turn time/abuse of coverage are impacting results, but these conditions will be in play if these products become widely used.