Close reading, not workshop rules, is the real education for a writer
Prose's central argument is that formal creative-writing instruction, with its checklists and generalized rules, is a poor substitute for the education available simply by reading great writers with total, patient attention — noticing exactly which words were chosen, why a sentence breaks where it does, how a scene is paced. She argues most writers who became genuinely skilled learned primarily this way, often before or instead of formal programs.
This isn't an argument against all instruction, but a reordering of priorities: rules taught in workshops are frequently oversimplified versions of choices that, in the hands of a master, are far more contextual and flexible than any rule captures. Reading slowly enough to notice the actual mechanics restores nuance that rule-based teaching tends to flatten.
Takeaway: the deepest craft lessons come from studying how great writers actually built their sentences, not from generalized workshop rules.