Two things. First, there's a weird genius loci factor in humans. I used to think that not having to switch context would allow for more throughput, but more and more I love splitting things in rooms, places. It allows for single task deep focus, and when you do something else, you're into that other activity. Be it eating, reading whatever. Going to an office can be part of that.

Secondly, isolation can lead to depressive states, but being surrounded by people is also a burden and some times worse. I can remember the feeling of joy when my floor left the workplace as I had to stay longer. I felt my spirit grow and fill the room, ideas, drive and motivation came back strong.