There are Japanese words that are written in Kana frequently despite having an associated Kanji (i.e. 轢かれる > ひかれる) like how 鰻 is often written as うなぎ when used as signage, is it because the Kanji is too difficult? They also do this in words where partial Kana is used rather than the actual Kanji altogether (i.e. 信憑性 > 信ぴょう性). I’ve also seen this in words such as: 刎頸 (ふんけい), 膀胱癌 (ぼうこうがん), 躊躇 (ちゅうちょ), 兎 (うさぎ), 髑髏 (どくろ), 鰐, (わに), 蝿 (はえ), 癇癪 (かんしゃく), 胆のう (嚢 exists, just use it) and so on…
One thing that sometimes trips people up with 常用漢字 is that it’s not just a list of kanji, it also includes readings. For example, 人参 are both 常用 but the second character is only listed with readings サン (as in 参加) and まい-る (参る). The ジン in にんじん is not on the list.