it's a good question and a lot depends on the builder. I have seen new boats with decks so flimsy they buckle when you walk on them and older boats with the glass so thick I am surprised they float.
Somewhere inbetween is the perfect medium between strength, lightness, and durability
Strength has not necessarily to do with weight. If epoxy and infused vacuum techniques are used you will have a lighter stronger and not less durable hull.
If carbon and epoxy are used and the carbon is protected from the sun, you would have an even a lighter, stronger and also not less durable hull.