Question Why are some Japanese words written in Kana instead of using the actual Kanji?

[LTDAN]

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 躊躇 is just transcribed as ちゅうちょ in written text in Kana more often (is it because the Kanji is too hard?). 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 or 肺癌 > 肺がん), like why? Basically the same with にんじん (人参), うなぎ (鰻), そば (蕎麦), てんぷら (天麩羅), ねずみ (鼠), どくろ (髑髏), ろうそく(蠟燭) & etc.

 

[NANGI]

Konnichiwa LTDAN-san!

To be honest, memorizing every kanji is impossible. That's why it's decided that only the basic 2,000 characters need to be learned. Therefore, kanji not included in the 2,000-character set are displayed using kana characters.

These basic kanji are called Jōyō kanji. There are about two thousand characters, but the number increases irregularly. The current exact character count is 2,136 characters.

Wiki - Jōyō kanji

The total number of kanji characters is unknown, but it is estimated that there are between 50,000 and 100,000 kanji characters. Can you memorize all the kanji?

NANGI