I first saw the saying:
"What you hear here, What you Say here, when you leave here, let it stay here."
On the wall of a Rec Room in the home of a Secret Service Agent, where lots of higher up mucky muck law enforcement used to get together back in 1964 to relax with 'their own kind' lol
Many years later, I heard it at what was to become my Home Group. A Closed participation meeting.
For me, new to AA, new to recovery, it gave me hope that AA truly was "Anonymous." Made me 'the newcomer' back then feel SAFE.
I see absolutely nothing wrong with this saying. A gentle reminder for both new and old alike, leave it in the room.
J M H O
PS I was only 19, and yes I was drinking with them drink for drink. Maybe another reason for the "Motto" to be predominately posted, lol as a reminder to them too.
Love and hugs,