It's a pity that most users are with dynamic IP and behind a NAT. This makes sharing directly with someone via BT impractical, so people still use email/messengers for that.
So whether it works depends on more circumstances
BT is great for "giving out to the world", but if you want to send a file to a friend, using an email, a cloud drive link or Skype/whatever is more practical. Intermediary storage is required for asynchronous transmission, and even if both you and your friend are online, you still need to take an extra steps of creating the metainfo file and sending it or a magnet link first and then wait for the DHT announce and lookup procedures to execute, which can take quite some time.
A sort of no-setup BitTorrent-only proxy would be interesting, to avoid NAT issues.