They have moved away from the waterspout theory towards a down surge theory.
We don't know whether any other yacht would have fared better in a down surge (or water spout for that matter).
And yes, it's performance in a storm etc would be considered for any sea going vessel. There is a limit to what can be allowed for however. If any craft.
We also don't know if user error, as such, contributed either.
The manufacturer seems to have pointed out at least one error (re. the anchor drag).
Seas, oceans, climate patterns, these are all inherently unpredictable
Yes and if it is a phenomenon like a down surge, it's unlikely another craft would:have fared well either.
Those are the risks anyone takes when on the ocean etc.
Especially when you can't or won't going to harbour for storms.
Personally I think this will end up being a level of incompetence/lack of risk management/complacency, perhaps combined with a trickier/more challenging than average craft.