[ekianjo]

> An even more subtle point is that kanji usage is fluid, so it's perfectly correct to write many words as kanji or kana, but with subtle shifts in meaning. For example, いい and 良い are both "good", but the latter is more formal and may even be read differently (yoi vs ii).

Correct, and sometimes words who are otherwise written in Kanji can be written in Kana in order to put emphasis on them, similar to how we use italics in Western languages.