Your putter should be helping you return the clubhead square to the target line
on the right path to allow you to hit the putt you’ve aimed to hit.

Your particular stroke, straight back and through, or with an arc,
is less important than your ability to hit the ball squarely down the target line.

What if I told you that many, not some but many, golfers are playing with a putter too long to encourage the proper rotation
and therefore can’t square the face at impact?