I couldn't really trust the author of the review after he established his preference for "quiet computers" having no cooling slots or whatever he called them. Okay, fine, you're placing aesthetics above actual performance, then. The Pro laptops are the only ones viable for any really hardcore work because if you push the Air too hard it is going to just slow down in order to stay cool and that's not what you want if…
Isn't the 'soldered-in' RAM and storage fundamental to the M-series architecture? It's not like there's a board with individual chips sitting in it for the RAM and storage, that could potentially have been 'popped out' if they weren't soldered in. It's all one giant 'chip' now.