Most organizations cannot afford to reduce every single risk to what some practitioners would deem acceptable. Providing actionable information about all the things that might happen, not by using terms like High, Medium, or Low, but in specific business terms will help evaluate which risks to take.
Should we give up auditing information security and the management of cyber risk? Not at all. But we should do so with eyes wide open. We should recognize the limitations of our knowledge, tools and techniques and the likelihood that hackers have new techniques that are unknown both to auditors and management.