Comment by yperr_string

You may have misunderstood what I mean when I use the term "publicly reachable".

It is not only the static nature of the IP address that make it more suitable for peer-to-peer.

It is the ability to accept unsolicited inbound connections on any port.

The key word is "unsolicited".

Essentially, the user pays extra for the "privilege" of less stringent firewall rules.