You can find an IV that makes sense for a single option with invalid other parameters, but things will break down when you go to price other expirations / strik

You can find an IV that makes sense for a single option with invalid other parameters, but things will break down when you go to price other expirations / strikes. When trading, you don't want to wait to see an "updated" IV, you would want to respond directly to changes in important and well understood parameters like underlying price.