Yes, there are ongoing efforts to evaluate and, ideally, support the clinical utility of neuropsychological evaluation. Also, given neuropsychologist's training intersection of neuropathology, cognition, and psychology, we can often provide insights to the patient and referral source regarding factors either causing or contributing to reported symptoms. We also get to spend a lot longer with patients, on average, than just about every other provider they see, and can be a source of psychoeducation and support for them (and their families and other providers). There's also a lot to be said from the patient perspective for just being able to put a name/diagnosis to something. We may not be able to do anything currently about, say, Alzheimer's disease, but it's helpful for patients (and their families) to know what's going on so they can plan ahead and know what to expect in terms of problems and needed supports down the line (and this is where cost savings can come in). We can also provide some insights in behavioral techniques for managing various symptoms, although I really wish we also had more geropsychologists to be able to help with this on a longer-term perspective.
From a medicolegal standpoint, yes, attorneys likely see value in the services we provide, otherwise they wouldn't pay for them. But like WisNeuro said, the strength of the evaluation doesn't always (or even often) relate to the ultimate judgment. It can be helpful to know this when writing reports and providing testimony. That being said, although we don't monitor or request information relating to outcomes, it stands to reason our work is probably helpful enough of the time for them to continue seeking out the services. From a civil perspective, we can also help in putting numbers to things that are otherwise hard to objectively and reliably measure (e.g., cognitive functioning).