In Science, what you call aberrations is where new knowledge is found. Exceptions to the rule are where existing hypothesis are refined to more accurately describe what is going on. The more accurate the description, the more probable that predictions based on the description will be right. Not to do so will give only a stagnant perception and faulty predictive value.
So far, your view unfortunately, is that of the stagnant.
Addendum: Textbooks are updated for a reason. Perhaps the book(s) in your library need updating as well.
Aberrations have their place no doubt, but they do not change the rule. Aberrations only produce variants within the boundaries of a species or family of species they do evolve into another family of species.
