I don't think they're that bad necessarily. These sorts of vague and fuzzy categories are very common in human communication. Even though there's tons of except

I don't think they're that bad necessarily. These sorts of vague and fuzzy categories are very common in human communication. Even though there's tons of exceptions and non-central examples to these categories, to the point that they're basically useless for anything formal, they tend to have actual value to normal human beings that need to communicate.