> That might be true, but the effects of any given outage would be felt much less widely.
If my system has an hour of downtime every year and the dozen other systems it interacts with and depends on each have an hour of downtime every year, it can be better that those tend to be correlated rather than independent.
If my system has an hour of downtime every year and the dozen other systems it interacts with and depends on each have an hour of downtime every year, it can be better that those tend to be correlated rather than independent.