Paul's post reminds me of a story that happened to someone I know. He bought a Pearson Triton - a boat a lot of people would consider to have bluewater potential - real cheap, and spent a few months fixing her soft decks and redoing the interior. He then set off on a sail down the CA coast, and sliding down the backside of a big roller he landed with a bit of a bump and popped a swage on the shroud. All of a sudden his rig was coming down around him - luckily he wasn't more than a few miles out. He called the CG, they helped him cut away the rig and towed him back in.
What would've happened had he been halfway to HI and a storm brewing? He shoulda know better than to trust 40+-year-old rigging.
Since then whenever I see a chainplate thru-bolted to the cabin trunk (likely without a backing plate ) or a spade rudder I think "How many big thumps would that survive?"