The biggest difference between remote and in-person is that many of those things can happen more easily without being scheduled. The organizational management skill bar you need to hit as a team is lower when the communication friction is much lower.

Talking to your teammate who sits nearby in person is both lower friction and higher bandwidth than sending them a chat method.

"Adhoc conversations" don't magically lead to knowledge transfer, the probability of any adhoc convo being long-term-meaningful is low, but they greatly increase the cumulative probability.