Why is 3 seemingly always the minimum? Why not 2? I did 2 days in-office for 2 years—it was a great balance. All the meetings ended up on Tuesday/Thursday and M/W/F was solid get-shit-done time at home. You also never started or ended the week in-office.

My whole team (it's a large one) is doing one day in the office per week. It's the same day for everyone. I personally like calmness of the office, so I usually go two times. I don't see any fundamental problems with that arrangement.

If everyone agrees on 3 then you can't work two jobs at once.