I would argue $100 for the lifetime use of a laptop is a no brainer expense to pay for a better screen. Assuming all other things are equal of course.This is my point. The Air screen IS great. The Pro’s is just even better. And in terms of the $100 difference in price: $100 is $100. For you that means you should consider and lean toward the Pro. Fine! For others that $100 may be a big deal and now they can get a Retina Air in their range.
I'm going by Apple retail pricing by the way. B&H currently has the base model MBP for $1250. Don't you think a much better screen is worth $50, again, if all other things are equal in your mind?
The issue isn't whether the MBA screen is good or not. It's just that they are charging you a lot at retail for something that is noticeably worse than another laptop that is very, very close in pricing. If the new MBA started at $1000 it would make a lot more sense. At $1200, it doesn't.