Exactly. Because that crap is useless to some people. I need an optical drive and a bunch of USB ports on my secondary, portable laptop like I need a hole in the head. Totally useless for me. I would never use these things.
The MBA missing 'functionality' for these complainers means simply that it isn't the laptop for them. For some people it has good functionality. It isn't perfect (I'd like built in EVDO for example). But a lot of this 'funtionality' that you many decry is useless if you already have something like a Mac Pro.
I still say that it depends on who you are and what you are looking for. Apple is making a niche notebook for a group of people that were looking for exactly that, a small notebook with only a necessary port and a plethora of wireless options. IMO they did a good job of filling the gap and serving that group.
But there are a lot of users that are mistaking the AirBook for the replacement to the 12" PowerBook and many users that have taken it (with glee) as such. Some are still holding out, and will be holding out for even longer. The 12" PB was what the Sony TZ and the TZ's replacement is competing (or was) against. It had the necessary ports, the optical drive, and a smaller screen.
If Apple does make a 12" PB replacement or an 11.1" MacBook Pro (I know... it won't happen...) then that book will be what people are after, the ultra small PRIMARY notebook with two USB ports, and optical, etc.
The AirBook is great for those that do have a powerful desktop sitting at their desk at home or at the office and want the perfect road warrior's laptop to take along with them, that they can essentially (given the amount of wireless) use anywhere at anytime.
I am more of a 12" PowerBook/Sony TZ kinda guy, but the AirBook is truly a nice piece of work.