My first day in Japan (early 90’s) I was in a train station in Tokyo. A suited businessman waiting in a long line put his briefcase on the floor and left the line for a few minutes. He returned to his spot with a newspaper. The case was still there. He had not looked around nor displayed any doubt nor hesitation. Nobody reacted or noticed.
I was born and raised in New York City. This was science fiction to me.
I was surprised to see in Taiwan last year several instances of people walking into a cafe and leaving their phone on the table to indicate the table was occupied and then going up to the counter to order.