You also never see movie theaters with just one set of mains and surrounds either, but the front channels are more centered on the wall than the surounds, they are not mounted to the ceiling are they? The surrounds are higher up but the system also runs mega watts and extreme loudspeakers, not quite what you get in a home system.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70