The "Brat Packers" simply do not merit the attention they are getting.
Merit is the central issue here. The only dues Sean Penn ever paid was to have actor/director Leo Penn as his father. Ditto Timothy Hutton, Nicolas Cage (Francis Coppola's nephew, I believe) and Emilio-I-did-it-all-on-my-own-Estevez-Sheen and scores of other snotty-nosed, no-talent don't-take-my-picture-jerks who make it because of nepotism.
The Robert Duvalls and Rip Torns of today have little chance to prove their worth in a market filled with industry brats.