As a Japanese person, I didn't realize how difficult Japanese is until I saw people learning it
As a native Japanese speaker, one thing that surprises me is how difficult Japanese can become at an advanced level.
A sentence can be grammatically correct and still sound unusual to native speakers.
Many learners think vocabulary and grammar are the hardest part.
But natural Japanese often depends on context, tone, and how people actually speak.
Even Japanese people sometimes explain things with:
"It just sounds more natural."
For people learning Japanese:
What part feels the most difficult or unexpected?