Another interesting point that I haven't seen anyone mention:

I am POSITIVE Yoshi-P said that getting all HQ mats would not only guarantee HQ, but would be the only way to HQ
Meaning having all NQ mats, or even most HQ and 1 NQ mat would always result in an NQ item.
I wondered what changed between then and now?

3 more interesting questions to discuss....

1. What happens when you use 1 or 2 HQ mats in a recipe that requires 4 or 5 ingredients?

2. Getting quality to 100% HQ rate, how is that balanced relative to how many abilities you have?
For instance.. If I have only Armorer to 50, but he is well geared, will I be able to guarantee HQ most crafts? If so, then having all 50's and having all abilities will make your HQing extremely easy

3. Will 50 crafters be able to guarantee 100% HQ on all recipes under 40?
If so, what are the in game implications of this?