Ive been sailing for most of my life, mostly coastal, and some short offshore hauls. My rule of thumb is detachable forestay and storm jim are the minimum. Sea anchors should be in the inventory also. Getting caught without the right equipment can mean more than just broken gear. Lives are often lost because of not thinking worst case scenarios before heading offshore.
My friends who went on my adventures used to rib me about all the equipment I carried, saying what are you planning for, a sinking? And I'd say exactly....