In my opinion, the problem is in poor logical thinking in the design of the supply switchover systems. The article indicates there are multiple power feeds and

In my opinion, the problem is in poor logical thinking in the design of the supply switchover systems. The article indicates there are multiple power feeds and power supplies (presumably to provide low voltage equipment power). For a single power feed all of the following results in the loss of the output, (1) no input voltage, (2) input over voltage (under voltage also???). However, in the article it implies that switching to one of the other redundant power feeds or power supplies only happens for (1). If the redundancy system had considered either (1) or (2) as a fault and to "find another supply, then shutdown this supply" then complete shutoff would have been avoided. Also, since the active power supply shut down and switchover also didn't happen, there must not be any monitoring of the output of the individual supplies to trigger a switchover. To me, this suggests there is also another single point of failure in the current design. I guess there is a market for smarter power failover systems.