The 64GB version isn't something I'd ever be interested in, nor would I be likely to recommend it to anyone, but the ridicule is unfounded. Microsoft isn't offering anything that everyone else offers as well, including Apple (http://store.apple.com/us/browse/home/shop_mac/family/macbook_air?aid=AIC-WWW-NAUS-K2-CONFIGURE-MACBOOKAIR). Why are they not considered to have "set this up for failure from the get go"? There are people who buy these devices and are quite happy with the amount of storage they have.
So are you saying that you know these disk constrained devices sell well or are you suggesting that it's manufacturers are being benevolent in providing at least something for those who can't scrape together the extra hundred bucks for twice the disk space?