Tech workers have a much stronger hand with their employers than many other groups. As a result I think we often don't see the kind of power imbalance that is going on and how hard it is to simply "do the rational thing" which seems so cut and dried to you.
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.
I disagree. The company has a responsibility to set rules around when it's ok to call people. Especially for junior employees it's very hard to decline calls from their managers late in the evening.
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.
Get a work phone/computer. Make it clear that you won't be available outside of business hours unless it's actually an emergency.
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.
I wasn't talking about myself or really any senior person. But tell that to an intern or someone in their first job. And that's the problem with flexible working, it's often especially terrible for the most junior employees.
Not only that, but there's a great deal of privilege in being able to say "no". It is something the talented tech worker gets used to being able to do, because they have options elsewhere. They can design their employment because they have in-demand skills. But it doesn't necessarily mean everyone is comfortable with it or can afford to risk the consequences.
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.