Slack is overrated and over priced. Its not like messenger platforms are difficult. We have had msn messneger, yahoo messenger, whatsapp, rocketchat, facebook messneger, messenger, gchat, skype. Slack doesn't do anything particularly special.
> platform
Slack isn’t a messenger app. It’s a platform. People like to “work” in slack for some reason. not that slack is so well suited, but because it reduces the number of context switches you need to do. it’s good to have something as a central hub.
If you produce some kind of app, you’ll want to integrate into a messenger platform and your choice (if only one) will be slack. this gives slack gravity and that is what makes it special.
salesforce the core product is nothing special. it’s salesforce the platform which matters.