So I think my filter for “appropriate to LessWrong” is that it should be an abstraction and generalization, NOT a parable or obfuscation to a specific topic. If there is a clean mapping to a current hotbutton, the author should do additional diligence to find counterexamples (the cases where more categories are costly, or where some dimensions are important for some uses and not for others, so you should use tagging rather than categorization) in order to actually define a concept rather than just restating a preference.
So I think my filter for “appropriate to LessWrong” is that it should be an abstraction and generalization, NOT a parable or obfuscation to a specific topic. If there is a clean mapping to a current hotbutton, the author should do additional diligence to find counterexamples (the cases where more categories are costly, or where some dimensions are important for some uses and not for others, so you should use tagging rather than categorization) in order to actually define a concept rather than just restating a preference.