I agree, it just sucks. I got a rev b refurb and it has the lines, but they are pretty faint. I just love the Air form factor for writing so much; I can lay on my back with it on my knees and it's simple to just whip around when I move around every few minutes. I just can't do that with my 15" MBP.
I saw those new icons on my iPhone and my heart honestly skipped a beat. I guess I have lines-induced PTSD...or line-shock, whichever you prefer.