> Most monohull sailboats don't even have keels let alone weights.
That's factually incorrect. Smaller monohulls that focus on racing performance often do not have weights, though they will certainly have a keel to reduce drift when sailing upwind. The exceptions are certain classes of tiny sports vessels.
Larger monohulls that are designed to be lived on are generally categorised under "class A" according to Europe's CE certification, but are probably sold with equal safety standards around the world. Class A means that they are impossible to fully capsize and will not sink with even a reasonable amount of water in them (well, de facto at least, de jure they only need to survive certain wind and sea conditions). For example, a class A yacht may roll over 90° onto its side and fill up with water, but will not sink. To pull this off, these yachts have heavy weights on the end of their keels to counterbalance the force of the wind pushing them into the water.
However, given enough water in them, even class A yachts will begin to sink.
Centerboards are not keels. You may not care about dinghies such as e.g. Lasers, but there are a whole hell of lot more of them around than there are keeled yachts. Neither of which have a damn thing to do with this discussion, since as I already noted and you repeated they're both much safer than ducks. This thread is like a parody: a stream of idiotic "well, actually"'s.
The comparison is between boats designed by engineers in the last fifty years, and boats not so designed. You're the one who wanted to talk about sailboats, which in support of my point are also safer than ducks. Please educate yourself before promulgating falsehoods: "Pretty much every monohull sailboat ever manufactured will sink immediately if the hull is punctured." Hilarious!
That's factually incorrect. Smaller monohulls that focus on racing performance often do not have weights, though they will certainly have a keel to reduce drift when sailing upwind. The exceptions are certain classes of tiny sports vessels.
Larger monohulls that are designed to be lived on are generally categorised under "class A" according to Europe's CE certification, but are probably sold with equal safety standards around the world. Class A means that they are impossible to fully capsize and will not sink with even a reasonable amount of water in them (well, de facto at least, de jure they only need to survive certain wind and sea conditions). For example, a class A yacht may roll over 90° onto its side and fill up with water, but will not sink. To pull this off, these yachts have heavy weights on the end of their keels to counterbalance the force of the wind pushing them into the water.
However, given enough water in them, even class A yachts will begin to sink.