I cannot say either way if they know how to back so I choose to enjoy and my enjoyment is from the people that can't back. Ive been backing since the late 70s and sometimes things go away. Those same kids engage in a fun way when the bad backer is having a fun time with it because sh.t happens.
Back to the OP, I remember again from the 70s when a car was spinning out at the ramp and all it took was 4 or 5 dudes with a beer in hand on the rear bumper and or the tongue of the trailer to get the boat out.