I've done a lot of Shakespeare onstage, and I'm not convinced that the Earl of Oxford was the author of all those works, but I am convinced that the Stratfordian William Shakespeare was not. My feeling is that it was an amalgamation of many writers, in the same way that most films are a collaborative endeavor.
Film and stage are very different; I don't necessarily prefer one over the other. Every few years, I get a big itch to go back to the theater. To learn humility, to learn bravery and to remind yourself that the pistons that drive your craft are working on full power. And to remind yourself how badly paid actors can be.