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It was beta before today? These channels have been a thing for forever, I assumed it was already GA.

Had the same thought. We have had it at our company for almost a year and I just thought it was a feature of Slack..

I have to wonder what "beta" or "moved out of beta" in this context means.

I suspect this announcement was just "oops we forgot to move this feature out of beta, lets announce that its GA"

Yeah it's been in Beta for like 2 years I guess.