Problem is not whether MS actually includes HDD as standard or not..I am sure not including HDD is FAR BETTER option in terms of price scaling in later part of console's life..they will be able to make Xbox360 lot cheaper than they were able to with Xbox. It sucks in terms of consumer's standpoint, but as MS no longer wants situation like Xbox, the choice was inevitable. I would take extra memory anytime over HDD...simply because memory scales lot better in terms of pricing.
But the problem comes from the fact that MS held the position like HDD was going to be standard on every Xbox360 available and everyone(and I do mean everyone) believed that 20GB harddrive is going to be attached on every Xbox360..even their official spec indicated that(although they were subject to without notice, but with something significant like HDD, they should've have put some kind of asterisk beside it)
But the problem comes from the fact that MS held the position like HDD was going to be standard on every Xbox360 available and everyone(and I do mean everyone) believed that 20GB harddrive is going to be attached on every Xbox360..even their official spec indicated that(although they were subject to without notice, but with something significant like HDD, they should've have put some kind of asterisk beside it)