The 6-throw rule always struck me as rather arbitrary, pointless, and rife for abuse. With the exception of legally excepted systems (fire pumps, etc), I don't see why there should ever be more than a single disconnect to shut down all power into the building.
Even in buildings fed from multiple services or redudant substations, technology still allows those breakers to be easily tied together to a single EPO button. In fact, I'd argue that cases like this- where the configuration can be complex- really do need a single simple EPO for safety.
