I think it’s interesting because even when a person outside of China is exposed to them, they might not realise the influence. Close to a million people a day play Dota 2 but I doubt they know that the Monkey King (https://youtube.com/watch?v=guGFT27SavM) is the main character of Journey to the West.
About these 4 books, are there any translations or Kindle versions you recommend?