I'm not sure I see the benefit of playing back just the IRC log. It is a plain text file, so a user could read through it at their leisure (probably faster than the typical 1 hour playback would take). There is a bug (LP: #794124) requesting links to irclogs.ubuntu.com for old sessions. The only situation I see a playback feature being mildly useful would be if a session made heavy use of URLs and slides. The playback feature would then be able to show the proper slide along with the text that went with it.
I'm not sure I see the benefit of playing back just the IRC log. It is a plain text file, so a user could read through it at their leisure (probably faster than the typical 1 hour playback would take). There is a bug (LP: #794124) requesting links to irclogs.ubuntu.com for old sessions. The only situation I see a playback feature being mildly useful would be if a session made heavy use of URLs and slides. The playback feature would then be able to show the proper slide along with the text that went with it.