Have you ever experimented to find out how long the conversion part of the mash really takes and how much the temperature of the mash falls during that period? It seems that many people think that it takes a full hour for conversion but that may or may not be true depending on how fine the milling is. Once the conversion is complete, the temperature doesn't really matter. Some of us have done overnight mashes and the temperature definitely falls a lot which in conventional thinking should get that person a very fermentable wort.....but it doesn't.