Still non sense. What are you comparing "kanji in written Japanese" with? In what situation do you think kanji are less advanced than the ones in written Japanese? In spoken Japanese, no? I can't think of any other situation than "spoken language", which is not "written language".
Again and again and again, there is no kanji, no hiragana, no katakana, or no romaji in spoken Japanese, or any other languages. These differences are appeared only in written Japanese.
It makes sense if you are talking about the difference in using kanji between newspapers and manga for children, though.