I can confirm this. I passed N1 without learning to write. I later learned how to write all of the kanji, and all it does it help you distinguish very similar kanji without context. I tried learning all the compound words (i.e. which kanji to use for every word) but gave up a few thousand Anki cards in. It was time consuming and impractical. (Wanted to pass Kanken 2) Props for anyone who put in the work though.