Not to mention, you aren’t as aware of down time when you’re there in person. You’re at the office, so most tasks you do still feel like work. If you’re a knowledge worker you might spend 4 hours getting actual work done, and you can see that way more easily at home. I think that’s why people have been more productive, because they think they’re falling behind when they really aren’t.
Plus, being in a familiar environment and not needing to wake up early for commutes is massive.