Exactly. It's like saying your tires wear down in the spots that suit your driving style so there is no need to rotate them.
It's going to wear more in the places where you contact the ball the most and unevenly at that. You can play with an uneven tip, but that will definitely lead to inconsistency, unless of course you pay attention and rotate the cue to ensure that the top wears evenly over 360 degrees. Consistency is why you should reshape your tip.
I used to be in the camp that reshaped very infrequently. I am far more consistent and my game has definately improved since I started allowing myself to keep a well shaped tip. It seems to me that telling yourself your tip doesn't need to be touched is a sort of ignorance is bliss type of thing.
I wonder how many pros don't fuss with their tips once they've been initially shaped?
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