It will be great that the owners can put the message on the top of their walls, without being squeezed to the place hard to find or even disappearing. It will be easier for the owners to convey information to the visitors of their restaurants. In case of vacation, the neighbors and friends will know that you are still playing the game and just leaving for some time.
I don't know whether somebody else had already posted this suggestion. If you have the same idea, please supporting me by replying it. I hope TL will consider it in the future update. Thank you!