Please for the love of god just don't use Slack. We have learned absolutely nothing. Let's all jump on the bandwagon of another closed-source, proprietary, walled-garden service and hand over all of our private intra-company communications to a private third-party in another country. GREAT IDEA.
Agreed, but with that said ... IRC has serious issues, and dancing around them or pretending they're not there is not helping. I talk a bit about them here: https://plus.google.com/u/0/+JeromeLeclanche/posts/icC6gDToB... The reason Slack exists and can be so successful yet entirely proprietary is a symptom that IRC is not good enough and that has to be fixed. It is the manifestation of the papercuts we, IRC users, ha…
A lot of the other deficiencies are a consequence of any decentralized, open resource, due to "tragedy of the commons" effects. Those will always require active admin participation to resolve.