Sadly, a lot of people (generally die-hard nerd types) genuinely believe that marketing was the sole reason for the iPhone's meteoric rise in 2007. They don't place any importance on user experience and therefore can't tell the difference between the iPhone and the early-gen smartphone predecessors (Palm/Nokia/etc).
These are the same people that are now confused as to why Slack has risen in popularity despite the existence of IRC, which (in their eyes) is technically superior.
To be fair, (as a Slack user) I'm not sure off-hand what Slack has that couldn't have been done on top of IRC. Almost everything could have been done with an IRC Server + Backend Services + Fancy Client model.
Problem: "Backend services" - how many of the Slack integrations don't have public APIs and Slack was only able to do it by being a single company? Good luck convincing people to set up the API keys for all of those services.
These are the same people that are now confused as to why Slack has risen in popularity despite the existence of IRC, which (in their eyes) is technically superior.