Yes, that is a key point of the illustration. Many apply market condition (time) adjustments based on a linear analysis. But, in most markets, price changes are not linear.
A PRICE change of an invidual property is not linear The linear pattern indicates a market trend. I though market condition adjustment were supposed to be about an increasing or stable or decreasing trend, not prices as a stand-alone for a property.
Market value is the opinion sought which is not the same as a literal price opinion. Unless FF wants to swap them out?
Of course, an individual price might vary from a trend, but how do you track it, and for what purpose? These charts do not tell us how it is done. And it would seem very open to challenge; this comp was adjusted up, then the next one down despite whatever the trend showed.
An individual price can often be higher or lower than the trend, for many , many reasons. Artificially assigning the variance in price to a time adjustment for that individual sale, IMO, is dangerous. It does create an artificial equality in price.
Prices can beeverywheree and often are, even in a stable market. That is why the adjusted comps form a range, not a single perfect price point.
The choice of the OMV within the range does have an element of the appraiser's judgment, but the explanation of why should make sense and be evident in the appraisal.