I'd imagine that a group of employees who already work well together moving to remote work would be very different than hiring/training/integrating new remote employees.
Different, yes, but nowhere near as difficult as I expected. We've continued to hire a lot over the past 7 months, and while onboarding people remotely took longer at first, I'm not really seeing meaningful productivity differences (due to the remote onboarding) after a month or two on the job.