Off the top of my head a) Nothing prevents the writer of the module you are importing from overriding symbols that you expect b) In many cases increased load

Off the top of my head a) Nothing prevents the writer of the module you are importing from overriding symbols that you expect b) In many cases increased load times. c) Irrelevant symbols present in scope when debugging d) Makes the order of import statements important, because potentially different modules might be providing the same variable name