An obsolete identity is a memory of how the person functioned before the onset of a cognitive disability. Learning and memory since the onset of a cognitive disability are reduced, making an update of the identity impossible. They may be aware of the mistakes they make, may not remember the frequency of their mistakes and rarely understand the implications of potential disasters. Insufficient cognitive abilities to pay attention to abstract information causes a lack of awareness of the need to adjust their evaluation of what they can and cannot do or say now.
Their identity is effectively frozen into the time period before they acquired a cognitive disability. They honestly believe that they can still do everything they could do in the past.
The validity of their signature on legal documents is subject to challenge because writing their name is a procedural memory retained long after the comprehension of words in any document is lost, as low as ACL 3.4. This sham being sustained in the medical and legal communities is an atom bomb waiting to explode.