This. SSL/TLS can ensure perfect forward secrecy when the private key is compromised, as long as the session information is ephemeral. With session tickets, compromise of the key used to create the tickets means every session created under that key can be compromised, regardless of whether the private key is lost. See https://www.imperialviolet.org/2013/06/27/botchingpfs.html for a great discussion of this.