The problem is how you are accounted for doing work. By tasks or by time spent in office... I saw people in office doing nothing, just talks on kitchen or answering emails.. When asked about tasks.. Im working hard sir.. heh.
Its a bit complicated matter, because when you are more efficient, boss usually will attach new tasks so you have to work harder or be even more efficient. And those who are less efficient dont get new tasks.. Not smart..
"Why aren't you efficient at the office? We've optimized it for efficiency" or "Okay well we'll budget in making you more efficient in office so that you're even more productive here".
Another could be the argument that you need to be highly available during core hours, you shouldn't potentially not be available during the core 8 hour work day of your location, and the best way to force that is you being visible in office by management.
The root of the issue is we value our time, and commuting is basically a loss of time and is not compensated. If we don't make enough money when commuting to make up for how much we value that time, we're losing. Most of us are comparing our salaries to what we used to make before this was the norm, and its not that different from before. So when going back to the "norm" we are losing part of what we consider our compensation packate -> more free time.
I spend some time pottering about and doing chores during the workday when I wfh. But I also spend lots of time goofing off while at the office. The difference is that while at the office, I have to be constantly vigilant about how I'm perceived by others, so time spend goofing off isn't nearly as rejuvenating and reinvigorating as it would have been at home.
Isn't it pretty normal to only have a few hours of real-work capability per day?
They'd rather pay you to do NOTHING.