Why 次第 instead of によって in this very example?

Question

I was randomly browsing [this page](http://www.comico.jp/detail.nhn?titleNo=58&articleNo=10) and came across this sentence: > 砂糖{さとう}は作｛つく｝るものしだいで使用｛しよう｝します。 This recipe happens to have a French equivalent > * En fonction des recettes, on utilise du sucre. > * Depending to recipes, we use sugar. (literal translation) > * In some recipes we may use sugar. (A little more glossed) so I can say for sure what was the intended meaning. But, what bothers me is that I have always been told that 次第で（は） is always followed by something that will change -- generally an increase/decrease, or a decision/choice. But here I have the feeling that 使用します is neither a choice or a decision it is merely a prescription: the recipe tells you to do that. I think that the sentence can be rewritten (with minor changes in meaning) to: > 砂糖は作るもの/料理によって、使用されます。 My question is the following: * Are によって and 次第で interchangeable in this context? * If yes what is the most natural option? * Is there any difference between しだいで and 次第で, the former seeming a little softer and childish (if at all I can consider しだい as childish)?

Answer 1

ご質問の内容から大変高度な日本語を勉強されているのが分かります。細かく個々の質問内容に回答する事は可能ですが、1番の成長方法はなるべく英語を使わず、日本語をより多く使う環境に身を置く事です。英語で考えずに日本語で調べて考える。上達のコツを沢山知っていますので、もし宜しければ一度サイトを通して連絡下さい。では