Conversation so far:
Can you provide me with a little more information on Confield, Draft 7.30?
What happened?
The new millennium brought about a drastic change in Autechre's style, demonstrated by Confield (2001) and Draft 7.30 (2003).
When you say drastic change, was it a positive or negative change?
CANNOTANSWER.

Question: What lead to the drastic change?
Self-contained rewrite: What lead to the drastic change in Autechre's style?