Few of our cases were cut and dried.
Autism is not a cut-and-dried diagnosis.
Jackson knew this would not be as cut and dried as she made it sound.
More than a modicum of rusticity is needed as a protection to a man who attempts such colossal reforms. This necessity had its consequences in the disquieting inequalities of Wagner's early work, and the undeniable egotism that embittered his fiery nature throughout his life; while the cut-and-dried system of culture of later Wagnerian discipleship has revenged him in a specially sacerdotal type of tradition, which makes progress even in the study of his works impossible except through revolt.
Though there are cut-and-dried instances when you should quickly and unilaterally give up on your existing product and iterate, other times will be more ambiguous or complicated.