Then why did the Slack Status page have so many problems at the same time? Half the time loading it would give a 500 Internal Server Error, 45% of the time you'd get broken resources (images and/or CSS), and only 5% of loads would give you the full working page.
Maybe because it's under a lot more load during an outage and they haven't upsized the status page infrastructure to handle their ever increasing user base.
