A school district is considering adopting a new curriculum based on a popular theory that suggests people have several distinct, independent types of intelligence (e.g., musical, athletic, interpersonal). The goal is to tailor teaching methods to each student's specific 'intelligence profile.' Proponents argue this will boost student engagement and self-esteem. From the perspective of a cognitive psychologist who prioritizes scientific evidence, what is the most significant weakness in the school district's reasoning for adopting this new curriculum? Explain your answer.