What Joe Biden has is probably not Parkinson’s disease, which is accompanied by trembling as well as a lack of balance. The wandering away and vacant thousand-foot stare, though, indict possibly some kind of mini-stroke, or a transient ischemic attack (TIA), in which a loss of part of the field of vision may occur, or involuntary action overwhelms.
These cocktails of psychoactive drugs being fed to Joe could be greatly accelerating the overall physiological decline. And that is elder abuse.
Not every Parkinson’s patient has a tremor or balance issues. Everyone’s symptoms are different. If he suffered a stroke, his symptoms would be consistent. With Parkinson’s, his symptoms will come and go based on his medication. It is quite likely that he has Parkinson’s or some other neurological disease. There is clearly something neurologically wrong with Biden and it is being treated with medication by his doctors (notice the difference between the debate and the ABC interview). Also, the fact that he can only function from 10am to 4pm is another indicator that he is on some meds that affect his cognitive ability. There is something going on beyond his normal stupidity and dimensia.
PD symptoms are not consistent across all patients. My dad had PD and the tremors that you mention. My father in law is currently close to stage 5 of PD and has no tremors. A man in our church small group (meeting biweekly) is in an earlier stage of PD (stage 3 maybe...). Joe’s gait, eyes, cognitive gaps, memory loss, lowered voice volume all indicate to me that he has PD.