I live there and I don't think you're wrong. They would certainly not be sued out of existence, anyway - suing is rare and is considered to break the harmony (和

I live there and I don't think you're wrong. They would certainly not be sued out of existence, anyway - suing is rare and is considered to break the harmony (和). I would also expect the device to detect it rather easily if the door doesn't close, or if there's too much resistance. It's not more dangerous than an elevator.