There is a popular joke that a Data scientist is someone who knows more computer Science than a statistician, and knows more statistics than a computer scientist.
Data scientists get easily get fed up with the various Theories and models they have.
However, this area has proven to be very difficult to understand.
While to a large extent, this is true, becoming a good Data scientist requires the mastery of not only these two key areas, but also some Theories and models crucial to this field.
There is a popular joke that a Data scientist is someone who knows more computer Science than a statistician, and knows more statistics than a computer scientist