I think the difficulties for learners of Japanese language arise from dictionaries. Even some Japanese native speakers find it difficult to search exact explanations in Japanese Japanese dictionaries.

And English native speakers tend to analyze phrases quite grammatically. This is not common for Japanese.
I think few people, if any, pay attention to grammatical structures so sometimes it is difficult for Japanese native speakers to explain it grammatically.
I think this is quite opposite to English native speakers. I've heard that they analyze grammatical structures in English on a daily basis.