There is some old stuff that sticks around because, even though it turned out to be wrong, it was worth a try; and if you didn’t keep it (and its critique) around, people would just keep re-inventing it. Platonic realism, Aristotelian necessary-and-sufficient definitions of categories, Marxism, and attempts to make quantum mechanics Newtonian are examples.
There is some old stuff that sticks around because, even though it turned out to be wrong, it was worth a try; and if you didn’t keep it (and its critique) around, people would just keep re-inventing it. Platonic realism, Aristotelian necessary-and-sufficient definitions of categories, Marxism, and attempts to make quantum mechanics Newtonian are examples.