Originally Posted by Gunther
3. Seen so many amateurs (myself included) decelerate through a short or fast putt and just ruin it so it's been drilled into me to always accelerate.
I know @iacas has said that he sees more of the opposite, and I'll defer to that because there is no doubt he also just sees a crap ton more putting strokes than me, but my first thought on the Faxon thing was related to this.
The (very) few samples of bad putters I know fall more into this category. They don't vary their backswing length based on the putt length or shot length (true about chips, bunkers shots, etc as well), so they try to control their distance with the through swing. On longer putts or uphill putts, they go ahead and give it a decent length follow through. They very well may be accelerating, but I don't know.
But on the downhill, short, or delicate putts, their MO is always the same; don't shorten the backswing, but just try to control speed with a pathetic attempt at shortening or lengthening, or speeding up or slowing down, the through swing.
Because of that, my guess on the Faxon tip was simply that he was suggesting that even though same distance back and forth was ideal, that perhaps he'd seen more bad putters with the stubby through swings and figured the best way to generalize a tip for the masses would be to cheat the other way. Along the same lines as the Haney "let's teach then how to hook to get rid of a slice" type method.
That was my first guess, at least.