Gravitating towards people you know happened already even in an in-person setting.

The difference is lack of opportunities outside of core work to engage with others and getting to know them, i.e. there are fewer and less diverse forcing functions. In the past it was getting lunch together a few times, now maybe the only forcing function is your manager assigning you to work or as a mentor, etc. Which is not as effective IMO to build healthy same-level relationships.