Like any other survey, personality tests are just a tool, and their success depends on the implementation rather than the evaluation itself. Psychologists debate the accuracy and reliability of many types of personality tests, especially the MBTI, because many quizzes label individuals in ways that imply that personality is static and unchangeable rather than improvable.
However, these tests can reveal critical information about an individual and also tend to inspire self-awareness and self-reflection, which employees can use to grow. Also, you can use personality quizzes as a team building exercise that facilitates bonding and fosters a sense of identity or simply as a fun activity that helps group members get to know each other better.