Biography attempts to explain subjective, internal experience through external factors. The explanation for something very interesting is found in something much duller.
I learn from a preface to one of those black Cátedra editions that Lorca's theatre has three constants. It is poetic, experimental, and has a single theme in every play: the conflict between individual and society, between desire and social convention, or whatever you want to call it. Of course, I agree that it is "poetic," but that can mean almost anything. I also agree that it is experimental, but once again that can mean just about anything. I don't agree that his drama all has one theme.