I'm not. Even when the negative is "right" for the papers I usually use (Ilford MGIV and MGWT), it prints differently if I decide to use some of the other papers I have (Forte PWT, for example). There's also the possibility (especially using roll film) that some compromise must be met, for a scene which would be best served by a different development time. It's not "hocus-pocus". It's a valuable tool, which any competent darkroom worker should be well versed.
Originally Posted by cliveh