The Sedan owner could well be new to boating and just wants it to be as easy and simple as possible. But they could just as easily be a veteran cruiser who has owned Flybridge vessels but no longer wants split-levels and stairs, either in their boat, or their living quarters on terra firma. This boat's primary purpose is less about chasing lunch as more social pursuits. Not so much about catching fish, as catching up.
Back in the classic era this configuration was also called a 'sedan', where double doors opened directly on to the cockpit area, making one big holiday space. Today, this style is generally termed a Sport Yacht.
The advantages of such a layout are many but the main one is the convenience of every activity being available on one single, flowing level. Everything is right to hand: helm, galley, saloon, dining, bar, entertainment systems; all within the comfort and protection of a roomy weatherproof space.