Even if you aim perfectly to allow for the exact break of a putt if you then roll your ball too fast it will miss above the hole. And if you roll it too slowly it will likely miss below the cup.
My final plea in defense of the preview stroke is that you’re already tapping its power every time you play — you just don’t realize it. Picture this: You miss the green. When you consider the myriad conditions surrounding your lie you realize that the chip or pitch you now face is unlike any other you’ve ever attempted.
Taking these slopes into account players have but a 15- to 20-foot effective landing area depending on green and wind conditions from the tee box. It’s one of the hardest 160-yard tee shots you can imagine.