Theseus’ ship is a philosophical thought experiment that asks what happens if you take a ship, replace it piece by piece until none of the original pieces are left. Is it the same ship, or is it a different one?
Now imagine the following response: “It depends. Is the ship seaworthy?”
This response is a bit absurd, because clearly the question does not depend on whether the ship is seaworthy. A ship may still be the same ship while falling into disrepair, or perhaps the ship was never seaworthy in the first place. And on the other hand, you could have another ship which is also seaworthy but is nonetheless a different ship. We may disagree on how to answer the question about Theseus’ ship, but surely whether the ship is seaworthy is besides the point.
Nonetheless, this seems to be the way people think about many categories. A laudatory category is one whose definition has become intertwined with the question of “is it good?” A pejorative category is one whose definition has become intertwined with the question “is it bad?” Let’s talk about a few examples.