I am going to start you off with some technical data. Make sure you stay awake.
(A) A putter face that is 2 degrees open at impact will miss the hole from 5 feet! For a putt to go in at 8 feet the angle of the face needs to less than 1 degree open or closed. Increase the distance to 15 feet and the putter face needs to less than 0.5 of a degree open or closed.
Can you tell the difference between 1 degree closed or open to your target line? I can’t.