Why is it that whenever a PC game lacks an inventory people immediately point to consoles as the reason why, as though "a list of stuff" or "things arranged in a grid" is far beyond what console gamers can handle?
There is absolutely, positively no reason a console game can't have an inventory, or customizable weapons, or the ability to pick up individual items. None whatsoever. In fact, there are many console games that do have these, um, "features" (they're so simplistic I hesitate to even use this word for them). Fuck, even Resident Evil 4 had a grid-based inventory, and games don't get much more "console" than that one.
The stuff they changed from System Shock 2 is not hugely complex stuff that only a PC's interface could handle. It wasn't Europa Universalis III. The game is streamlined because Irrational wanted to streamline the game, and they arguably went too far. It's not as if this can't happen without a console's interference, just look at Master of Orion 3, Ultima IX or King's Quest VIII for other examples.

