What he was detecting, I believe, was the play in the pintle and lunette-eye. He did not mention the noise it makes. There is no play and there is no noise in a ball and coupler. I often drive very close to wildlife out in the desert. If they are not looking my way, they don't hear me.
Silence is golden.
Since there is no play I am able to exercise precise control backing-up and pride myself in never having been in a situation where I could not back out as easily as I drove in. The slight amount of slop in a pintle does not give you the precise control backing up as does a ball and coupler. One last thing. I have pushed the limits pulling trailers. It is my job.