Awesome information, but silly complaint. The word "quality" in many cases should be changed to "Class". Magic/Rare/Legendary being a class of equipment. When I first read that MF increases the "quality" of the gear, I took that to mean in allowed for higher affix rolls. Obviously, after reading the article, you make if very clear that is not that case. However, for those TL/DR people, it might be something helpful.
Again, sorry for such a stupid complaint. Outside of that I can't thank you enough for the data. It's a great study!