Blue water design boats still have an inbuilt structural safety factor (redundant in-built strength) of about 3:1, in comparison to a 'coastal' design of approx. ~2:1, or 'inshore' design of ~1.5:1. Many of the old 'slide rule' designed blue water boats now 'back-calculate' to almost 4:1 safety factor when they are examined under 'computer calculation/refinement'.
When your strip away all the 'glitz' and more 'economical/vogue' shapes, Safety factor is still the remaining engineering method of artificially increasing the 'design' strength requirements to account for 'unseen , unpredicted and unexpected' stress loadings ... and so far 3:1 for offshore still 'seems about right'; otherwise, the insurance carriers would be demanding a change to the 'scantlings'.