I am for google,
because, after all, Kanji is Chinese.
It is like Latin-originated English words are, after all, Latin.
What is やさしい？
it comes from やせる(get thin)
優しい（YASASHII)：gentle, or 易しい:easy
Thin (and weak ) people are often gentle. -> やさしい（優しい）
Thin (and weak ) people are often easy to handlle with -> やさしい（易しい）
It is Japanese(not Chinese) and using hiragana "やさしい" makes sense.