Word or phrase describing preference for written language over spoken language

What is a word or phrase describing the prioritization of or preference for written language over spoken language?

Example 1:

They have a [insert word/phrase here]. They continue to write their language exclusively using a millennia-old literary form that has long diverged from their spoken language.

Example 2:

Ali learned to write fluently in a dozen languages, but he did not bother to learn how to pronounce most of the words he writes. He has a [insert word/phrase here].

My first guess was “graphological bias,” but that doesn’t seem correct, as Google phrase match search returns only two results for that phrase.