Byregot's Blessing is a Quality action. It's use is in making the item High Quality, rather than Normal Quality. Someone with only one crafting class can make the NQ item all day long, until materials run out, but making the HQ item takes those cross class skills.

If it is the word "compete" that you object to, oh well. He talks about the difference between having one class leveled and being an omnicrafter. That, and the general idea that crafters are not just meant to be crafting for themselves, means the specialist system was meant to allow a specialist with one class leveled to make HQ, starred stuff at level 60, just as an omnicrafter can make HQ, starred stuff at level 60. That is a comparison between the two conditions, and I was referring to the practical outcome of such a comparison as the two competing against one another on the Marketboard.

The truly level comparison between them would be to have the Specialist able to use all the cross class skills, as regular skills. As I said, that would give the Specialist an advantage over the Omnicrafter, which would be balanced by the inability to produce refined mats from other classes.

While "it would be enough" to give just those few skills, it would not be all that fair to just give those. You cited five skills, 1 WVR, 2 ALC, 1 CUL, 1 CRP. So an ALC would only gain access to 3 new skills, WVR, CUL, CRP would gain access to 4 new skills, and GSM, LTW, BSM, ARM would each gain access to 5? That is not exactly a fair distribution among the various classes, which as I stated above, is a good reason to just give all 21 to all 8 classes.