Pre-COVID I was one of 3 remote people on my team, rest worked from the office. This arrangement didn’t cause any obvious problems.
:(
And if there isn’t you can’t work from an office anyway.
For me, I preferred blend. (Caveat: office ~25 minutes away, some on-site campus amenities including dining, and WFH included scheduling flexibility)
I could slot annoying business-hours-only chores into my WFH days, or shift work earlier and later if I needed to be there for a kid thing.
And 2 days of that a week felt about right. I got the facetime and meeting stuff done my other 3, and had quieter, individual progress time those 2.
Good point, as I imagine my satisfaction in both scenarios would have decreased with a mandatory shared space.
Although, for a while we were "homeless", leading to ~30 minutes a day trying to find an office / conference room to squat in.
Infra-office (ie in person) for the high bandwidth interfaces, usually the whole team is in the same office.
Inter-office for lower bandwidth interfaces, ie between teams and functions.
You definitely have some interactions that are effectively remote, say if your project involves working closely with $remote_team, but in general the highest-order terms in the equation should be in office, if you are doing a traditional WFO org.
While I've enjoyed remote work a lot, I don't think it's here to stay. For places that will allow employees to start going remote 100%, if even a minority of the team returns to the office and has daily facetime with management, those other remote employees will return IMO.
In other words, post COVID, if your company isn't 100% remote then I don't think anyone will be full remote there, it's a disadvantage.