) It was set up as a strict one design and the uber-conservative culture of the class prevented any significant change to hull, foils etc. How could you have had a Laser with a hull half the weight of the original Laser and still sail old and new hulls in the same one design class?
But a lot of us like vintage cars and vintage wines and vintage songs. Why should we not sail vintage boats?
The Laser sailors I've known have won Moth worlds, done the America's Cup on an AC75 foiling cat, won cat Olympic medals, won 18 Foot Skiff "worlds" and nationals, built their own boats, and done just about everything else in sailing. So class "culture" isn't uber-conservative because the sailors know no better, but because we know that we sail Lasers because we DON"T want to get stuck into a gear race.
It's not conservatism per se but logical conscious choice.