Isn't "while further investigation might be necessary" incompatible with "the authorities determined the design might be to blame for the sinking not the collision." or is it just me?
How certain should you be that there is a serious design flaw in a product before you feel it's warranted to warn others who own that product that there might be a problem.
> authorities determined that the stuffing boxes weren’t working properly
The why and the how could make the difference between bad design, bad implementation, or bad luck.