Actually the only reason is because the HT industry has decreed this is what they need to sell more stuff. HT is based on turning your home into a theater. This makes sense only if you have rows of seats to fill, or you watch movies from way off center. Which is kinda bad, no matter what video source they all look best straight on. Just like all audio sounds best from one sweet spot. Which if you are there then there is no need whatsoever for a center channel at all.
Other than like I said, they need to sell more stuff.
Other than like I said, they need to sell more stuff.