Why does in-person contact create more impactful human connections than relationships based on purely virtual meetings?

While meeting someone virtually over platforms like Zoom allow for humans to meet and establish real relationships, meeting in-person creates more impactful and intimate relationships.  A person is able to get to know others over virtual meetings, but there are very important non-verbal communications that are absent when people meet virtually.  

As Sherlock Holmes would say, through the "powers of deduction" when two people spend time in a room together, you can observe and study the other person's behaviors in ways not truly possible over virtual technologies today. When spending time in-person, one develops a more intimate understanding of their fellow person.  This more nuanced understanding of one's peer, allows you to establish and stronger relationships.