You would think that over time as the experts learn more and get smarter that their ideas would all converge on the actual truth. But I guess we're not there yet. Mills certainly liked to take jabs at House.
The gist of House's book is that it presents his mechanics model. The model was created by watching high speed video of the best pitchers in the game and identifying their commonalities. As such, it's based on what great pitchers actually do as opposed to someone's belief system or conventional wisdom.
BTW, I am NPA-certified and have been trained by House.