Strong disagree. Pending sales are crucial in sharply increasing markets. If your time adjustments aren't based on today's pending contract prices, then you aren't providing the true value as of the effective date. You are providing a past appraisal based on when the last comp sold.
Contracts fall through in only 1/10 transactions. And I have data showing the ones that do fall through will go back under contract at a higher price within days. Contract sales are great data-points!
There is nothing wrong with givin the most weight to pending sales during reconciliation, as long as there are closed sales that also adjust to support market value. If you don't have closed sales that also support, then the adjustments are wrong or you are overvaluing.
In stable markets, pending sales aren't very relevant. In sharply decreasing market, the same thing above applies.