Think of it this way...
Would you rather have your proofing system mimic the actual press condition (hopefully the optimal condition) or have your pressman twist the press to match some proofing system that may or may not be able to reproduce the best tones, grays and gamut of the press?
When I was a young apprentice, I wondered why we could not hit certain colors on the Matchprint or Cromalin proofs with our press. The answer turned out to be that the proofs were made "cold" from separation films and pigments sheets or powders. The press is a hot process in which there is some ink mixing (wet trapping) going on when two or more inks hit the same spot on the sheet. (some examples are purples and many browns) The cold proof could not predict what happened to these colors on the press.
A press profile is created from an actual press print, including the effect of ink mixing and the actual gamut of the device. With a press profile, the CMYK color separation is in the sweet spot of the press. This is even more important if you are using a stochastic screening system which has less ability to modify the color output of the press during operation.
Trying to match a proof on press with a proof generated profile can be a more expensive and less color accurate way to operate.
Randy Zaucha
Managed Color
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