A popular online quiz suggests that people who are creative and intuitive are 'right-brained,' while those who are logical and detail-oriented are 'left-brained.' Based on the scientific understanding of how the brain's halves function, what is the most accurate critique of this idea?

A popular online article claims that people can be categorized as 'left-brained' (logical, analytical) or 'right-brained' (creative, intuitive) based on their dominant personality traits. From a scientific standpoint, what is the most significant critique of this claim?