I like learning new things, but it feels likely that I'll never understand how a golfer's feet, clad in what is often a thick and stiff layer of leather/plastic/TPU/whatever material, could somehow be a better judge of the tilt of a putting green than that same golfer's eyes.
Tim, you walk on somewhat sloped surfaces all day, every day without relying on your eyes; only the sensitivity of your feet. The idea of feeling slope with your feet is as old as golf itself, not only in putting, but in full swings, the short game, and just walking the course. Aimpoint is nothing more than a quantified method for putting.
Second, if a golfer is slow AND using Aimpoint, he’s not slow BECAUSE of AimPoint; he’s slow because he’s slow. The vast majority of the AimPoint Express method can be, and SHOULD be done while others are putting, and I’d add that you NEVER walk around and look a the putt from all four sides in AimPoint. If a golfer does that anyway, that again is just generic slow play; it is NOT AimPoint.
Third, the reasons for using AimPoint might vary, and might go beyond just putting. I’ve had 8 procedures on my right eye in the last 4+ years, and that eye is effectively destroyed now. I have very poor depth perception, and while that bothers my full swing only minimally, I have had to completely relearn the short game, including putting, especially reading greens. I chip with a hybrid whenever I can, for instance, to minimize my issues with x act ly where the ground is; it looks closer than it actually is on chips. Putting is much the same.
Aimpoint has saved my putting, and my ability to compete. 5 years ago, I was a great putter, and while I’ll never be that again, I’m competent and competitive again. My eyes just can’t see small slopes anymore, but my feet can feel’em.
And I play pretty fast, btw.