I go into the office once a fortnight and the commute takes 2 hours out of my day. If it was 5 mins away I'd maybe have a preference to up that to once a week, maybe a bit more of it wasnt open plan.

I think there is certainly benefit in being in the same physical space as the rest of the team on occasion. I don't think it has to be often though, even the kind of once every 6 months to a year thing some fully remote companies do might be enough to make a difference with team building.