Tesla's warnings to put your hands on the wheel are obviously insufficient based on regular videos of drivers asleep at the wheel on the freeway (https://www.theverge.com/2020/9/18/21445168/tesla-driver-sle... https://www.youtube.com/watch?v=ZhObsMnipS8 https://www.businessinsider.com/drivers-sleeping-in-tesla-ca... and many more). At a bare minimum, their code needs to bring the vehicle to a safe half rather than continue on its way forever dinging if the user refuses to interact with it.
And no, there are far worse things that can happen. https://www.bbc.com/news/technology-51645566 https://apnews.com/article/ca5e62255bb87bf1b151f9bf075aaadf