You always had the right to ignore after-work email, it was never the law that allowed this, only social pressure. The law isn't going to change the perception

You always had the right to ignore after-work email, it was never the law that allowed this, only social pressure. The law isn't going to change the perception that if I answer this email, it will get me further along in my career. Even with this law, the person you are competing with for that promotion will still probably answer after-work email, so you have to as well.