FWIW, it wasn't the tiniest slimmest computer available, and I already had a lighter PC laptop that also had a DVD drive (Toshiba Portege). It was one of the lighter options that ran OS X, but only a handful do by design. If I could have gotten something slightly bigger, lighter and with more upgradeable components, I would have. But Apple didn't sell it.
In any case, this is missing the point. You're reacting to what you perceive as my griping. But I'm not actually griping. My point is that Apple is motivated by profit, and divides the hardware they produce with market segmentation. If they get the segmentation wrong, or if there is a bunch more profit that can be extracted by segmenting it differently, they'll extract it, like any company should. Limited hardware expandability is a part of that segmentation, as it reduces the bleed of low-margin parts into high-margin segments.
Of course Apple doesn't have a big incentive to add such ports, but the fact that they've left them on the desktop Macs and the non-retina (and bulkier) MacBooks are an indication that it's not primarily a business decision, but more likely a design decision.
There's barely enough room on there for an upgradeable SSD.
Until they make a standard DDR3 socket that's smaller, there's simply no way to fit removable memory into a computer that thin.