As an aside, I've often been surprised how little some of these features get valued. For instance, I've looked at neighborhoods where one side of the street backs to other houses and the other side backs to parkland. The nicer side is generally more expensive, but it's not a huge effect, and often homes on the bad side go for more money (because of the building itself).
Mark to market. If you sell your home, then that value is the fixed price of the home until the next sale event.
And don't you think it's funny: we can't have rich people moving here because that would drive up land taxes, and we can't have poor people moving here because that would drive down the total resale value. I guess people should only be allowed to live among their exact socioeconomic equals ...
> this wouldn't happen very often
Then, I suppose we would have no reason for the term "gentrification", if it's that damn rare.
I'd argue that the factors you've listed are relatively easy to factor into an appraisal.
Property taxes, in comparison, are really hard to compute. Each jurisdiction has different rules. There are different valuation methodologies. If you add a 2 car garage, what the useful life. What depreciation schedule should be used. How should inflation be accounted for.
I agree with your comment generally and am not sure what part of the original comment doesn't make sense to you.
EDIT: Reread my original comment and see your point now. I phrased the "easy" part too strongly. I mean "easy" in relative terms... compared to what's being done currently, but agree the wording wasn't great.