It's not the your opinion differs, is that's you are presenting a cognitive dissonance. If you have years of experience then you would understand exactly how th

It's not the your opinion differs, is that's you are presenting a cognitive dissonance. If you have years of experience then you would understand exactly how this happens, and yet, you think it was avoidable, which is a misunderstanding of operational failures. If this failure was so easy to avoid, it would have been avoided. It was the result of a combination of failures, as all failures in highly-available systems are. It was a failure in bitrot, in planning, in execution, in communication, in reluctance to failover due to a concern about failing back, etc. That said, like Matthew said, this is the kind of failure that happens once.