to analyse Poul Anderson's future histories;
to compare these future histories with others;
in some cases, therefore, to draw attention to the existence of these other future histories, e.g., A ShortHistory Of The Future by RC Churchill (see here and here).
Churchill fits works by Bradbury, Vonnegut, Orwell, Huxley and others into a single future chronology and those others include Bertrand Russell! See here.
Moral: The world is not small but vast and interconnected.