"It's literally just telling people to plan their lives around yours", I agree, but on the other hand why should people have the right to tell you to plan your life around theirs, isn't that arrogant of them?
Regarding this, and also not answering the phone, and turning off email, it depends on what sort of job you have.
For me this is all about: my best work comes from when I'm in the flow. So I'll do anything to avoid being taken out of it.
I am a software developer, freelance, mostly work from home. I have deadlines, and I mostly work in fixed-price projects so the longer it takes the less I earn per unit time. I can get high-quality work done the fastest when I'm in the flow.
Is it the right of the customer to call me and interrupt me from my flow? I've agreed to deliver the software by a certain time for a certain price, that's it. They might be my client, but I did not agree to be reachable at any time for any impromptu meeting on any topic of their choosing. I agreed to deliver software, not reachability.
It's literally a zero-sum game. They want help planning something, or they have a question, they're in the flow about that, they don't want to be taken out of that flow. On the other hand, I'm in the flow about my thing, and don't want to be taken out of it. It's perfect for the other people if I always do what they want, but sometimes you have to stick up for yourself and do what's best for you.
Calling them back a few hours later when I'm out of the flow, or emailing them back 6 hours later the same day, has always worked out well for me.
I understand that not all jobs are like that. What I mean to say, it's nevertheless wrong to assume that no jobs are like that. Mine is like that, and the approach to using the phone outlined in the article. is great advice.