If your exit strategy is flipping or perhaps a short term rental (3-5 years) then market value is very important.
For me, I tend to look at long term holds. Market value is important but much less important than the value I can afford to pay and know that I have an adequate ROI and sufficient cash flow. Many non numeric considerations play into that.
Zoning may allow me to convert the current use of the property to a higher and better use.
The local economy may declining and the long term job market may look poor.
A property might be located near wetlands, lakes or other waterways. While this can be an attractive feature it may mean that you can have trouble with septic systems, trouble in remodeling, trouble rebuilding if a property were to burn down.
There are some beautiful homes on the Puget Sound near where I live. Many of these homes are now on lots that would only allow minimal remodeling and in many cases if the homes were destroyed the lot would be unbuildable.
There are many nonnumeric things to consider. They may or may not be factored into the market value, but in my case market value is not the most important value I consider.