Earlier quoted context omitted.
It is impressive, but considering the obvious compromises(replaceable components and ports) and the probable compromises(harder serviceability) i wouldn't quite call it a miracle. I also don't understand what the rationale is behind sacrificing Pro features for size on a laptop marked "Pro".
I can well imagine some pros who view upgrading RAM as a very important, even vital feature. I can also view many pros who view the thinner size as far more important. As it turns out Apple also makes a not thinner "pro" laptop you can upgrade the RAM on so what's the big deal?
Considering the for $400 more over the price of a standard Mac Pro notebook you get the new screen, 4g more memory, light weight, and SSD, it really comes off as a good deal in the scheme of Apple pricing. Yeah you lose the DVD, which I cannot recall when I last used one.
My suggestion is just order it maxed out in memory, if the $200 is something to quibble about in a $2200 laptop the you should not be buying one in the first place.