Agreed (mostly). There is far to much expectation of "perfection" and every time I hear the ol' "we are owed as much because of what we spend" I cringe. Just because something is expensive doesn't mean it's required to be perfect, nor does something sub $1000 even truly classify as "expensive" in the electronics world.
Bottom line is: if it bugs you that much, DON'T buy it. It is an absolute testament to how good Apple is (and how poor the alternatives are, in both quality and experience) that people can waste day after day swapping unit after unit that makes them miserable.
I am not saying the "problem" doesn't exist. It does. In complete honesty, my Air has a little yellow tint in the bottom left corner IF I crank the brightness way down and LOOK for it. If it's an issue 99% of people wouldn't notice if they didn't know it existed, why would Apple address it? To satisfy the 1% of folks that still can't live without it anyway?
It's the best 10" tablet. Plenty of other tablets have minor abnormalities too, but none of them have the fanbase that Apple has, so Apple always has to deal with things being blown WAY out of proportion.
Enjoy the device. If you can't, find one that you can. Apple really doesn't care, and frankly I don't blame them when 99% of the user base is perfectly satisfied and not "looking for problems". I can find fault with ANYTHING. I'm glad I don't though, as it would be a pretty miserable existence.
Good luck!