When people speak of works that “have withstood the test of time” it’s worthwhile asking “Withstood for what?” and “Withstood for whom?” For instance, The Malleus Maleficarum is indeed an immortal work, but it’s not remembered for the reasons its authors and admirers might have wished. The same nuancing holds for classic SF. Overlapping this is the forelock tugging to so-called “hard” SF that, inter alia, seems to still hew to the fifties concept that only physics and astronomy are quantitative sciences.