I want to know the answer to the following question:
What is the main criticism of Greg's work?
All the background I'm provided with is that "Whereas Greg had limited his illustrative examples to English Renaissance drama, where his expertise lay, Bowers argued that the rationale was "the most workable editorial principle yet contrived to produce a critical text that is authoritative in the maximum of its details whether the author be Shakespeare, Dryden, Fielding, Nathaniel Hawthorne, or Stephen Crane.". Is that enough to answer the question?
Answer: no