Throwing around the phrase 'it girl'

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Why do people keep on throwing around the word it girl to 5 gen idols. 5 gen isn't even over to see who is actually the it girl of that generation,like guys please wait to see who might become the future 'it girl'.They could just call who they think could be the it girl in the future 'the potential it girl' (also I wrote this post because I'm just annoyed at these people throwing the phrase 'it girl' for 5 gen idols when it literally means 'a female idol who is exceptionally popular, influential, and well-known, both within the K-pop community and among the general public, often seen as a trendsetter and a symbol of the generation' )