The Pro is indeed faster than the air (Did I say the opposite anywhere ?) but the Air has plenty of power for his uses. Now is it foolish to buy the air over the pro ? I would say yes if IR was Indeed a fantaisy of "one or too people" but it´s not. It is a real issue and just because some people don't experience it right out of the box or don't want to see it does not mean it is rare nor real. As a previous owner of both a rmbp 15" and a rmbp 13" (all of them had IR and I tried to exchange the 15" 3 times) I have seen plenty of people saying "Mine is fine you are just unlucky" and then months later, those same people would come back and say "damn my screen is starting to experience IR, what can I do ?". Personnaly I do not care I'm just trying to save some people the hassle of wasting time with returning or exchanging their brand new computer and wasting an important amount of money. I really think if you are looking for a mac with the 13" form factor then because of IR the MBA is still the best choice at the moment. It is my opinion based on facts, take it or leave it, it is your problem in the end 🙂
(Still you are right that the Iris is a better graphic card.)