The new GOE system is tailor-made for Hanyu.
Beyond which, the 4A is not about upgrading his base value, it's about making history. If base value was his preoccupation, he'd be focusing on easier high-value quads like the flip and the Lutz. And if he lands a 4A successfully, the judges will shower him him points. When you're already attempting the hardest quad possible, putting the 4Lo right after that is unnecessary extra risk. Yes, if he could do both of them in succession reliably that would be beneficial in points, but it would also markedly increase the risk of a serious error, and that's more dangerous to his chances of winning than a few base value points.