The 2x zoom allows a person to fill a 60 inch screen with the projector located anywhere between 5 to 10 feet from the screen. This is important because if a person is in a small office, the projector can still be seen by all. Or, if it is positioned in a boardroom, there will not be a problem with the image spilling off the screen.
It all comes down to convenience. This is the advantage that Casio has over the competition. No one else has 2x zoom.