Earlier quoted context omitted.
They messed up here in some way, but assuming you know what events and complaining about their skills is just making stuff up at this point. Unless you can tell us exactly what happened, maybe hold off with that kind of criticism.
> However, we did not anticipate that the expansion process would require the server storage to be temporarily offline. One, it is obviously some flavor of raid rebalancing, there’s not a different kind of thing it could be. Two, they’re admitting they didn’t expect this, that’s not possible if it’s a tested procedure.
"did not anticipate" can be interpreted in different ways too. It may be "didn't know it could happen", or just "estimated it to be so unlikely that emergency downtime was acceptable as a response".
I've seen outside speculations as an inside person before and they're often very likely to be BS. Let's stick to facts and skip the "obviously" and "not possible" until we learn more. What's happening right now may be their prepared and tested procedure. (Or it may not)