Well it's true, I don't know the class very well. So you might pardon my ignorance in wondering if this "probably strongest and safest sailboat around", two years old, breaks in two in 40 to 45 knots downwind under greatly reduced sail, then do the "almost strongest" break in two in 30 knots?
Doesn't seem right..
You forget to mention one racing full circumnavigations, several transats and many races. Most 50 year old sailing boats had not done anything remotely similar to this in what regards millage and none was subjected to structural stresses a boat like this is subject while racing at more than 20k in bad weather.
But obviously nothing of that has to with this accident because all the other many dozens the boats of this class, older boats, had done much more than that, some during 20 years without any structural problem so the answer, as I had already told you, is obvious:
A built defect or an error in design in what regards the stresses this type of boat are subject.
Anyway, as I have said already, not a common case, in fact so unique (structural catastrophic breakage) that I don't know of any other in several millions of miles these type of boats had sailed in racing conditions.
I fail to understand your concern regarding the safety with a type of boat that by its sailing record is one of the safest if not the safest sailboat around.
Regarding this particular case it is needed an investigation to know what went wrong: the design or the building but again this is an isolated case in a type of boats that reached a very high reliability and safety, a type of sailboat that has been improved in that sector every year on the last twenty.One that this year had already saw its rule modified to provide a greater reliability with the keels and masts.
I would say that if you knew these boats and their rule, particularly in what regards safety, what you would say is that all sailingboats should have that standard in what regards safety measures
Any boat can break in stormy conditions if the boat has a structural defect and has been pushed for a long time till that defect assumes catastrophic proportions....and this boat has been pushed hard for many tens of thousands of miles or even hundreds of thousands.