Continuing the story of my previous posting...
It was brought to my attention this isn't Bioware's first foray into offering as DLC content that should have been part of the original game. Dragon Age : Origins, a CRPG released by the same company a few months earlier, was missing what many consider a standard component of such a game: a chest or stash to store all your hard-earned loot. It was a curious omission.
Well, guess what? One of the first bits of purchasable DLC offered by Bioware included this very feature. The Warden's Keep DLC does offer significantly more than that (new quests, new locations and new items) but I can imagine a number of people are going to buy it simply for the storage chest.
Given the additional content offered in Warden's Keep, this example is a bit less cut and dried than the missing Mako in Mass Effect 2. Still, it's hard to imagine that the absence of this feature, so common to many other role-playing games, simply slipped by such a talented development team. And, judging by the speed in which gamers modded it into the PC version, it obviously isn't something that was all that difficult to code.
So if it wasn't because it was an unusual feature, and if it wasn't because Bioware just didn't have the time or skill to add it in, you just have to wonder: why wasn't it part of the game in the first place?