In Australia the email thing being discussed is largely a sideshow to the law that was recently passed.
The behaviour of concern relates to the kind of bosses | managers that make a point of contacting employees out of hours and pressuring them to attend the office | answer questions at length, etc.
It's the direct phone calls and obsessive DM's @ 2 minute intervals that being targetted - most people handle auto generated work related emails well enough, they learn to disable notifications and have muscle memory for "Dismiss".
I just don't understand America. And, since this law was apparently necessary in Australia, not that either. They're both just weird.