Can't have a factual should. Shoulds are normative.
>What is kind of useless is a word that can mean some thing or its opposite
Is the word really useless or indeed useful if no one can provide a 'real' example of actual ambiguity between the two meanings? Furthermore, it's not as if ambiguity between one meaning and an opposite meaning is the greatest ambiguity there is-- if anything, it makes it particularly obvious which meaning the speaker intends.
Can't have a factual should. Shoulds are normative.
>What is kind of useless is a word that can mean some thing or its opposite
Is the word really useless or indeed useful if no one can provide a 'real' example of actual ambiguity between the two meanings? Furthermore, it's not as if ambiguity between one meaning and an opposite meaning is the greatest ambiguity there is-- if anything, it makes it particularly obvious which meaning the speaker intends.