i havent been following the thread since i am too busy lately but i think i have seen this mentioned somewhere
this afternoon, i was convincing my wife WHY i needed the Z6...
I took the Nikon FM3a that I just overhauled last night and the Nikkor 45/2.8P with me to shoot st patricks day.
while at the shop, i tried the P with the FTZ and like what Birna or whoever mentioned, it did have some communication with the body so turning the aperture dial on the Z6 controls the iris ONLY up until f/5.6 and then it stops-down properly as i make an exposure. I did have to set my lens to f/22 though...
Now, i don't know why Nikon didn't just do this for ALL F-mount manual lenses and add a disclaimer that exposure won't be accurate for pre-AiS lenses because the iris isnt linear. it would have added more functionality to the Z6