Here's the thing, there are some forms of nerve damage that we currently don't have a cure for, there are far more that we don't even understand well enough to have an idea for a cure, and there are some that are so poorly understood, even significant swaths of the medical community doubt that they are real and accuse patients of being drug seekers.
For example: Fibromyalgia. It isn't a disease in it's own right, it is a classification of a set of symptoms that have not been able to be attached to a source. There are lots of theories and progress is being made in the field. But when the causes could be genetic, dietary, environmental, psychological, or even sleep related, any step forward could be helpful for some subset of FM sufferers, but leave the rest without aid.
If this approach can be made to work, it would mean that virtually all of the FM sufferers in the world could lead a normal life, while at the same time research continues on the underlying causes of their conditions.
When you wake up every day and have to see your spouse, your child, or your friends in agony because for no meaningful reason their brain decides that they should feel like every joint is coated with sandpaper, that every muscle is strained and torn, that every tendon is inflamed, then any option, even one that profits some greedy ass in a suit, becomes a miracle.