It makes me sad to think you have formed this opinion on her more than decade long career that spans a variety of genres and many collaborations based on a few brat songs you may have listened to
Music is a subjective thing, but what I like about Charli XCX is her albums have completely different sound from album to album, but are consistently fun to listen to. As if it puts you in a certain energetic mood. Listening to albums in full you can tell many tracks experiment with the genre. For example, she brought a niche thing like hyperpop to mainstream listeners in her prior 2 albums before brat.
