Imagine your professors and textbooks werent there to teach you, but they were there to show off their knowledge or to prove you that you know nothing.
A very known problem in my country is that a professor is not making a lecture to teach you something or to explain you something, the professor wants to show off his knowledge - that he is the king and you are a nobody.
Then you get unreadable textbooks full of big words (sometimes you think authors dont grasp them)... which are just plain student unfriendly.
I remembet that I had borrowed some statistics books from USA - and they were easier to read in English than the crap I had in my own language. They were easier to read and easier to understand. No big words. Just explanations and examples.
On a side note, they taught us physics with English abbreviarions. When most students didnt know English.
Think you are in 5th grade and they nake you memorize things like: d = s x t
You have to figure out that it is distance, speed and time.
Note that those abbreviations have nothing to do with the local language. Also why even use abbreviations? Lazy teacher (AND lazy textbook) could have used full words at least. In own language, not English.
Most people from US dont realize how much easier you have. For starters you dont spend a lot of time learning English as a foreign language. Then the non-Americans can get books that are written to teach you something* not to show that the author is great. (* although now I think most textbooks are written for profit).