As many students above stated, having a clinical background depends on the role. There are some roles like the PI that require clinical background, this is because the role is usually critical and can’t allow much mistakes. Having clinical background means that the person has experience and practical knowledge of the situations. There are other roles that are flexible and can allow an area of learning and mistakes, like the data analyst. Any mistakes done can be undone. These roles don’t really require clinical background.
So, the more crucial and risky a role is, the more practical and reliable experience is required.