Historic dramas have always been money in the bank. Get some well known actor, cover him in old looking stuff, and tell a fake story involving true people. Drama ensues because that's what people make. Get two or more people together and they shit themselves with drama. Historic comedies, though, are super rare because nobody wants to make people important enough to talk about into a bunch of raging assholes, aka real people. Death of Stalin doesn't mind so much.