I look forward to some rational discussion by the R & A and the USGA on this topic.
But the only way to interpret "rational" in this context is to mean "reflects your own subjective likes and dislikes" about how people make a putting stroke. This is an argument born of an emotional reaction that is purely subjective.
In that sense it is perfectly rational of you to want the rules to be written in a way that relieves you of having to feel such intense dislike for how some people choose to putt. But you still need to understand it for what it is. There is no "rational" way to judge the desirability of someone swinging a putter while it touches, yada, yada, yada.
It's like advocating a "rational" dress code, meaning one that requires collars on shirts and all hats to be worn brim-forward. It's only rational in the sense that someone who experiences emotional disturbance at the sight of a backward ball cap wants that particular thing outlawed.