Culture shock is a actual factor and speaking from encounter, it was not enjoyable to be illiterate when I moved to Japan in 2012. https://treewake.com/%EC%95%8C%EB%B0%94%EC%8B%9C%EA%B8%89-%EC%97%AC%EC%84%B1-%EA%B5%AC%EC%9D%B8%EA%B5%AC%EC%A7%81%EC%9D%98-%EC%83%88%EB%A1%9C%EC%9A%B4-%ED%8C%A8%EB%9F%AC%EB%8B%A4%EC%9E%84/