I have tremendous respect for Pete and I can understand his thought process. I'll share a different viewpoint.
I am fully understanding of a client's past history. If they practiced black hat techniques in the past, that is not my concern. The past is the past. If I work with a client, they must agree that going forward they will not use any black hat SEO, and they will actively work to resolve any issues so their site complies with Google's Guidelines.
Based on the above, I complete the Reconsideration Request. I have nothing to fear from Google. I would have already reviewed the client's website. I would have identified and be actively working on any outstanding issues. I practice full transparency with Google. This approach is how I choose to operate, and I believe I am more successful because of it.
What's the alternative? Hide from Google? At best, it's only a matter of time until they catch up.
Perhaps I am naive. But if you do have a manual penalty then the fastest way to resolve it for the client is the Reconsideration Request tool. Google can actually help you identify the issue and they can tell you exactly what is required to resolve it. I'll share one example.
When I was reviewing the manipulative link issue mentioned above, I found many free directory sites and I initially classified those links as being ok. Based on the information shared from Google, I re-evaluated those links and removed them. I firmly believe if we are fully transparent with Google and sincerely try to resolve violations, they will be helpful. That is my experience. Many others share different experiences. When I question them and review their communications, I quickly determine they fall short of full transparency so I can understand why they are struggling.