Ex 32:16 - The tablets were the work of God and the writing was the writing of God, engraved on the tablets.Several places in Scripture we read of God's written Word (Ex 34:1; Deut. 31:9-13; Joshua 24:26).
What is the specific value of God writing His word? Certainly we learn from stories that we hear and that are passed down. But, I appreciate the value of the written word as Wayne Grudem expresses in Systematic Theology: "The reliability, permanence, and accessibility of the form in which God's words are preserved are all greatly enhanced when they are written down (50)."
I am grateful especially for the accessibility of God's written word. Even throughout history, the development of the printing press, and more recently the internet has given people the opportunity to read the very words of God in their own language.
I am grateful for ministries like Wycliffe and projects like One Verse, and the work they do in Bible translations for those who don't have God's written words in their language.