No real point to it i say. 5.1 may be selling yes, but from what i've seen so far from others who have bought speakers (like me), they only use 2 speakers of the 4 or 5 because of lack of room, or the room is so full of stuff that it just sounds terrible in comparison.
Sure they have many devs for the team, but audio would still have to be tested like everything else in the T:V project. Different sound drivers tested with different speakers and differnet sound cards, and that takes time, and time is money