Not true. There are circumstances where you cannot properly expose all parts of the image due dyanmic range variations in the shooting conditions. You can expose properly for one part or the other and either blow out the highlights or block up the shadows. The lesser of two evils is to expose so the highlights don't get blown and if you still need to you can lift the shadows...this works ok in a lot of circumstances, but not all. In particular, scenarios where you have larger areas of smooth shadows, pattern noise can become a very real problem that will be visible even on moderate prints sizes.
Nikon shooters never encounter such situations? Doubt so. Anyway i think this happens so rarely its not a real problem.