Prayers When Shabbat and Yom Tov Coincide
Question
If Shabbat is the most important Jewish holiday, more important than Yom Tov, then why does the Yom Tov liturgy take precedence over that of Shabbat when the two coincide?
Why is it that the main body of the Amidah text is that of Yom Tov, with some Shabbat additions, and not the other way around?