First, this conversation has little to do with fair use. Fair use is when there is an acceptable reason to break copyright. For example when you are making a parody or critique or for education purposes.
What we are talking about is the act of reading and/or learning and then using that information in order to synthesize new material. This is essentially the entire point of education. When someone goes to art school, they study many different artists and their techniques. They learn from these techniques as they merge them together in different ways to create novel art.
Everybody recognizes this is perfectly OK and to assume otherwise is absurd. So what we are talking about is not fair use, but extracting data from copyrighted material and using it to create novel material.
The distinction here is you claim when this process is automated, it should become illegal. Why?
My opinion is if it's legal for a human to do, it should be legal for a human to automate.