I have a problem with the affirmation I underlined.
The nature of incident reading is that it leaves aside the reflectance of the subject. In the same light, with the same incident reading, a middle grey subject will be rendered middle grey, a bright subject will be rendered bright, and a dark subject will be rendered dark.
Provided it is uniformly lit by a source. Since, blackest black is approximately 4.5 stops to whitest white. So incident metering will render blacks and whites satisfactorily.
It needs some adjustment when there are shadows and highlights.
OM-1n: Do I need to own a Leica?
Rolleicord Va: Humble.
Holga 120GFN: Amazingly simple yet it produces outstanding negatives to print.