Must admit, after a month of ownership, I hadn’t realised that you were not supposed to stand on the arm rests.
A BMW I had once developed a fault with the front seat passenger sensor, which meant it sensed someone sitting in the front seat (when it was empty) and alarmed because the seat belt was not in use.
I had no option but to get it fixed, because a fault on the dashboard would have been an MOT failure. It was an expensive fix and I was told that it was commonly caused by people kneeling on the passenger seat to retrieve items from the back seat, breaking the webbing / wire connection to the seat sensor.
As a result I had thought it best to avoid standing on the seats.