The point I would make is that the WFH experience is very different for different groups. Like everything about the Pandemic it has had totally inequitable impacts on different people.
I'm in tech and I've had no issue, but many people I know are not and I've seen how it works out. Not everyone can just move to another job. Perhaps most people can't.
This has become a bigger issue as all communication is via phone or computer. Before, a lot was via personal interaction which just wasn't possible once you left the office. Now, no one really knows if someone is working or has already called it a day at any given point.
My Dad resisted getting a mobile phone from his company from the mid eighties to the 2000's, on the principle that if they can't contact you, they'll figure it out themselves.
Some workplaces do set boundaries, and it is not universally true that "harder and longer" working brings benefits.
Almost everyone I know works normal hours or less even during WFH.
To be perfectly clear, this is true regardless of WFH. Your work will never set boundaries for you as they benefit from you working harder and longer.