Well... sometimes they are terrible.
We have no problem trashing the "experts" here, when we feel like a vent.

Case in point.... my urologist.
My physio put me on 5mg daily Cialis months before the surgery, to minimise the effects of nerve damage or surgical scarring.
I asked the urologist who was doing the prostatectomy if I should continue with 5mg Cialis.
"Oh, I don't believe in that".

Umm... what?

"Avoid coffee. It's a diuretic".
"No. you can eat & drink what you like".

I'm beginning to think that contradicting information is their source of amusement.
But sometimes these "specialists" are wrong.
So here you can say "My doctor said this. Does that sound right?"
Most of us aren't medical professionals, so can't give medical advice - but we can say "No, my urologist never mentioned that & I had no trouble".