So read it as:

> The biggest problem with IRC [for Slack’s principle use case, which does not apply to me] has always been its lack of server-side history.

You can understand that while still personally preferring another messaging model.

I have no idea why you wouldn't mind that, but thats fine, you do you. I am curious though, if you don't mind sharing why?

To everybody else who are hit by this, they would not consider it a feature but a pretty serious limitation, since if you didn't care about server side logging in first the place why would you mind messages disappearing after 90 days?

Regardless though, IRC also doesn't persist user names which I think is a serious limitation.