> The message is in a light grey colour until it's confirmed. This morning alone, I've had multiple messages start off black, then turn grey after about 10 sec

> The message is in a light grey colour until it's confirmed. This morning alone, I've had multiple messages start off black, then turn grey after about 10 seconds. And that's not just true today, but other time Slack has been down as well. "If it's black, it's confirmed delivered" is not an invariant.