Those examples appear to be more about exposure technique than exposure placement on the film curve. Adjustments to the meter’s recommended exposure need to be made in situations beyond what the meter was designed for. Some call it being smarter than the meter. Spot lighting has a small lit area surrounded by a large unimportant dark area. The meter is going to want to compensate for the dark area which will overexpose the lit area of the principle subject.
Another example is shooting a daylight scene where you want to include a large amount of sky. The light bright area will make the meter underexpose the land area. The solution is to either open up some or tilt the camera down to balance the two elements for the meter, then reframe.
Mark, I have Dunn’s fourth edition. Where did you read the part about low lighting and the thoughts about not including shadows?