My current job used to be fully in the office before covid. That was some 5 years, so yeah, I was pretty "used" to it. After covid, it stayed "flexible", where I mostly WFH. Before this job, I also used to work one where it was "flexible", with multiple WFH days.

Sure, I didn't do "nothing" while in the office, there was some productivity. I still manage to get stuff done when I go there. But the difference in productivity between when I'm home and when I'm in the office is abysmal.

I don't have to put up with my colleagues being on the phone all the time. I don't have to put up with a chair that gives me back pain, or with contorting myself to reduce the glare on my screens. I don't have to endure being squished in the metro for half an hour each way or get up at absurd hours to avoid that. I don't have to eat at random times or in front of my computer because the lunch corner is already full.

Could I "get used to that" all over again? I guess. People who need to take the local public transit "get used" to it being unreliable and a general PITA. Do they enjoy it? Would they be happier if they wouldn't have to put up with that? What do you think?

I think the general issue, as I alluded in an answer to another of your posts, is that there indeed are people with differing preferences. And we could have people do what they prefer. But problems arise when we each try to impose our approach to others. Want to go to the office because for some reason you prefer that? Enjoy! But then, don't turn around and say "yeah, but going at the office and being alone (presumably because the others hate going) is all downside without any upside, so everybody should come in".