We taught a guy once, in Boston, who was the club president. Private AimPoint lesson on their practice green. We had scoped out a putt that broke about 3.5' to the left. There was a flower bed by the curb behind the green that, due to the angle of the parking lot, appeared to slant the other way. Well, Mr. Club President comes out and says "Oh, I can read this putt." So he goes to the back side of the hole, walks around the other side, eventually goes up and sticks the tee in the ground about a foot outside the hole… and says confidently "that's where I'd aim." A classic under-read, you may think. Well, the guy put the tee to the left, as he thought the putt broke to the right. Maybe owing to the curb, I don't know, but he'd used his eyes, and not only under-read the break, but got the direction of the break entirely wrong. And this wasn't a 0.5% slope putt - it was significantly sloped.
When we were first trained in AimPoint like 15 years ago now, Mark Sweeney had everyone stick a tee in the ground at about 15' where the straight uphill putt was. I have known John Graham for quite awhile, so I used the method from back then to get within about 4" or so. Another fella in the group put his tee at a place that was nearly 90° to the straight uphill putt, and many were as far off as 30-45°.
Putting using your eyes is often pure folly. Read an article by Dave Pelz and he'll tell you how poorly average golfers read greens. If an AimPoint clinic or lesson did nothing but convince people how much putts actually break by rolling balls off of a Perfect Putter, it'd be worth while for most golfers. Again, I've had people put their tee in the ground 1 cup outside of a putt that breaks 8' from 25'. Very few put their tees in the ground where you can hole the putt at any speed (i.e. ~8' by speed or less, and at ~8' by it's gotta be dead middle and it'll pop up before going in).
But, by all means, keep arguing from a position of ignorance:
- It doesn't work.
- It leads to slow play.
- It leads to more footprints.
You're the ones making the claims. You need more than "it looks like" to make your case. The data and experience I and others have says the opposite.