There are a few reasons why a Sam Cooke biopic has been difficult to make. One reason is that Cooke's life was full of controversy and scandal, including his relationships with women and his struggles with drug addiction. Another reason is that Cooke's music is complex and difficult to replicate, which makes it challenging to find an actor who can both sing and act the part.
Despite these challenges, there is still hope that a Sam Cooke biopic will eventually be made. Cooke's story is an inspiring one, and his music is still enjoyed by millions of people around the world. If a biopic can be made that captures Cooke's essence and his contributions to music, it would be a welcome addition to the film world.