PwP want to know if their treatment is as good as can be expected.
In respect of PD, do hospitals keep track of the performance of doctors. Of course, this is not simple, there are issues of the reliability of the measures used (e.g UPDRS), statistical significance and bias (you may want to give all your worst cases to your best doctor ) that need to be addressed if the process is to be meaningful. But, yes I do think that knowing that one doctor has kept 80% of his/her mobile 20 years after diagnosis while another has kept only 20% mobile, is useful information.