The defence didn't want the evaluation in the first place so I don't know why they would be disappointed.
But further, you are jumping the gun somewhat. We don't know the full evaluation hasn't found he suffers from an anxiety disorder since all that has been disclosed so far is that OP does not suffer from "mental illness or defect" that affects his appreciation of wrongfulness generally, or that could have affected his appreciation of wrongfulness that night. That's all we know so far from the report none of which means he doesn't have any mental condition or personality disorders, and the fact prosecution and defence have sort of reserved the right to refer to it and dispute other parts of it would appear to show there are other conditions reported just that these would not have affected his appreciation of wrongfulness that or any other night.