I’m definitely not an expert on Bittorrent, but I believe the person above was incorrect - I think there are some extensions to the protocol that enable UDP transport, but typically Bittorrent traffic occurs primarily via TCP.
What you said makes perfect sense in that hypothetical context, though!
No, that definitely isn’t its usual purpose. We do it to soften otherwise mechanical interactions where there is no expectation beyond the exchange of information required to facilitate a transaction.