Launching Question

I ALWAYS see guys unhook their trailer strap and safety cable from the trailer, back in, let the boat float off and someone "catch it" with the ropes while they take off. Years ago when I bought my boat new, when we took a test drive, the guy at the dealership had me back in the water, then unhook the strap and safety cable while standing in the water (Wear boots when it's cold!). 16 foot aluminum deep v with no rollers on the trailer. 50 hp Merc.

So is there a chance of dumping it off the trailer short of the water doing it the first way or am I just being paranoid? Thanks!

Launching Question