Imurg
The Grinder Of Pars (Semi Crocked)
The majority of golfers are traditionalists.....MyGolfSpy have either updated or re-done their testing, documented on a video I just watched:
I was playing with a +1.5 handicapper on the weekend and he was adamant the flag keeps the ball out, and he always putted with the flag out, so this piqued my interest in the whole subject again. But that video again seems to prove that keeping it in produces the best results. One thing they don't account for is wind and flags leaning one way or the other, but otherwise their testing is quite conclusive. Even ones not in the centre of the cup seem to be aided by the flag, which I found surprising.