Interesting, hopeful...
Well, like "fishy" said, diagnosis it hit-and-miss. My wife went to several specialists, until we finally got a "movement disorder specialist" who was able to nail it. Those who say "no big deal" haven't been there, I'm guessing. Each case of PD is different - and as of yet there aren't any reliable biomarkers. Once we get a good biomarker - a lab test of some sort - then that can become a way to dig deeper into the mechanisms of the disease. It's really complicated...
(Sherlock, because it's complicated.)
Biting the hand that feeds IT
