Was perusing the page (you can find it here), I came across the paragraph "That said, word order is a complex aspect of language, never wholly mastered by non-native speakers.
What is the idea behind this? Does that mean that as a Native English speaker I have mastered concepts that foreign speakers will not master? What would some examples of this be? And is reverse true, as I am learning German no matter what level of proficiancy I obtain a native will understand better than I?