When you are parked, you don't have steerage until you accelerate enough to get some flow over your rudder. A mono hull would take a long time to gain that steerage. Therefore, parking a mono hull would mean giving up control of being able to steer enough to avoid a collision.

Since we are able to power up our rudders so quickly, parking is practical. For a mono hull to give up their steerage in order to relax, would not be a true way to relax since they'd be worried about some numb-skull driving into them while they are comprimised.

GARY