I actually think the worst thing about the suggestion you're replying to is that it is an over-generalisation. "Most players will do X", "they nearly always do Y"... yeah, okay, but what about the 10% who don't? The 1% or the 0.1% who don't? What about the ones who do as you describe, except for 5% of the time when they don't, or when they get lucky? I've hit genuinely lucky shots in a game, accidental good plays, for the receiving player they probably thought I was cheating, and yet I wasn't. The potential for false-positives is horrible, and you end up outlawing legitimate behavior based on a poor understanding of play.