Also keep in mind that it may be slower than with direct in person mentoring but there can also be the opposite of in person mentoring and then being locked in the same office can become extremely stressful.

I also run a small team with new hires on one day and I'm seeing great productivity and teamwork.

We are going back to the office eventually but I don't think the on-site requirements will be as strict as in the past. In the medium term I see us moving towards a more flexible model beyond just the flexible allocation of desks (which imho. is a horrible thing, pretending to be office workspace and serving neither then needs of people there nor the companies output).