Quote Originally Posted by cliveh View Post
... if you photograph something with the correct lighting ratio for the film you are using and get the exposure and development right, this is often not necessary...
True enough.

There are also many occasions when dodging/burning are required to produce a print that conveys a range/ratio of tones.
Imogen Cunningham apparently kept 'maps' of her very involved burns/dodges. Something tells me that she wasn't compensating for bad lighting/processing.