last year the corp closed both barkley and ky lake to boat traffic when it was high to prevent property damage as well as the ramp having guard rails signs and other fixures under the water.
but to answer your question yes it is about safty as well as property damage. damaged docks are unsafe.
it seams easy for you to complain so i would assume if that was one of your boats at the marina you would be first in line to complain about the ramp being open causing lots of problems there.
the closed ramp doesnt prevent wakes but it minimizes the wakes as there are not large tourny and parking up and down both sides of the road people are not taking risks and parking in a flooded lot. so it isnt about just one thing it is about lots of things. the most important isnt that fisherman have unlimited access it is about being responsible and taking a precaution. there are lots of water and other ramps , fish are everwhere not just in a hole you cant reach, expand you lake knowledge and fish somewere new.