Originally Posted by
Kestiel
Not necessarily true, the way it works when you stack quality abilities (Byregot's and Purification for example) doesn't add the % together, but compounds them. So if you get say 20 quality from an early careful fail, Byregot's turns that into 40, Purification turns that into 80.
Note that Perfection + Byregot's has a static set of 80-100 (120 is the most i've personally seen with +70~ STR on BSM, grain of salt an' all that). Which isn't all that much more than a standard failure early on with Byregot's and Purification, yet when Byregot's and Purification succeed on say a 35 quality base, that becomes a total of 140 quality, drastically outstripping the safer method.