I'm on annual leave, so your comment doesn't apply to me, but it's pissed me off so much I couldn't just scroll on by.
Plenty of people who WFH work damn hard the majority of the time. This year, I've worked through an entire week of annual leave (didn't get that back, or any slack at other times) worked on loads of my non- working days and worked late. I don't get paid overtime, like many others who do the same. So if I had been working this week, and if it had been quiet, who are you to judge if I'd been wrapping presents between meetings.
You're tarring everyone with the same brush.
There will always be people who take the piss, regardless of where they work. In the office, you can usually find them in the kitchen, chatting in a corner somewhere, taking extended lunch breaks, or 28 toilet breaks a day.
Yes of course the people you've mentioned work bloody hard. But usually, when they're away from work, they're away from work. No logging on to check emails, no calls interrupting their non-working time or annual leave. My dad is a white collar worker. He's gotten out of bed in the small hours every day for nearly 50 years, doing an important and dangerous job. But when he's home, he's home. He doesn't have to think about work, check his emails, receive phone calls, and he's never been asked to cancel annual leave like I have.
It is perfectly possible to work from home and work just as hard as the people you've mentioned.