I bought the Macbook Air with the intention of using it to replace my aging desktop rig, but was pretty surprised to find that it couldn't drive both of my monitors. Now I had to choose between my 1440p monitor which flickered violently when attached to the Macbook, or my 1080p panel which had a much less disturbing pink line in the bottom half of the screen. After a few hours of troubleshooting, I plugged my desktop in and promised that I'd use the Macbook Air to replace my Thinkpad. At that point though, the value proposition of the computer was so diminished that I couldn't really justify using it. I can't use my OS of choice on it, I can't use my software of choice on it, I can't upgrade or fix anything on it, and I can't trust the swap to not shred the SSD.
Am I missing something here? Time and time again I hear people say "you're not the target audience", and I'm getting the impression they're right.