Quote from AAAintheBeltway:
There is no question that the ideal way to strike a putt is with a square putter face moving in the exact direction you want t he putt to move. SBST sounds simpler, but you have to think about how you move the putter face SBST.
To achieve a true SBST stroke, the shaft angle has to remain constant. You can't do that without moving the entire handle, shaft, head assembly together as one piece, or by manipulating your wrist. That is a lot easier on sort putts than long ones.
If the angle of the shaft between your hands and the face is changing, you are either arcing the putter or you are doing some complex manipulations to keep it square. The anchored and long shaft guys are taking wrist manipulation out of it, but they're still arcing the face. There is no way they can avoid it.
(1) Commentators often talk about, "... forming a triangle with arms and putter shaft, then rocking the shoulders"... that's to produce a SBST stroke.
(2) Not so important on long puts. You're taking a guess which is outside the range of "probably making" anyway... pace is more important.
You say, "... The anchored and long shaft guys are taking wrist manipulation out of it, but they're still arcing the face. There is no way they can avoid it...." Got any data or reviews to back that up? Seems illogical and I still don't believe it. I'm thinking the primary advantage of the long putter is to PRODUCE SBST stroke and ELIMINATE arcing.