It seems obvious that a huge (and hard to solve) reason for this is simply language! There are many levels of language proficiency: Level 1: Can read and write it at your own pace Level 2: Can comfortably converse in a professional setting (little slang or cultural knowledge needed) Level 3: Can comfortably converse in a social setting (slang, faster speech, less clarification) Level 4: Can do all of the above passiv…
edit: combined two sentences into one.