Star Wars episode V and the rest of the earlier movies are often known for being the "better ones." While they are older, they feature a type of storytelling that the first three (yet, once again, later released) movies don’t. Star Wars was the cult classic of a generation and just like Shakespeare, spoke to a certain crowd in a way nothing else could, so why not combine them?
Shakespeare wrote some pretty dark plays. Much of them feature grim themes and death, so how could he not work well with the Dark Side? These books tell the story of Star wars episode V in Shakespearean rather than a Shakespeare play with Star Wars characters which makes it even more compelling. Yoda also already spoke like a Shakespeare character so there wouldn’t have to be too many changes there.