I disagree, from a certain point of view. Consider the CDN. One customers downtime is the IRS’s filing date. The IRS’s slow time is during the Super Bowl. The NFL’s season of rest is baseball season. Baseball goes dark on cyber Monday.
When should the CDN undertake updates? Continuously.
(Obviously I do get your main point: the NFL should not upgrade at halftime of the Super Bowl. But there is a time and a place for different models.)