As a developer, I try to "get in the minds" of other developers sometimes. I try to think, "If I had to build this same system, and ensure it was tuned properly, how would I be building it?"

However, I interact monthly with other SEO guys and learn from their thoughts on what they see from the trenches with their content. They commonly tell me that they think that the Google search engine is not fully automated -- that flags are sometimes raised and low-cost staffers react to those flags when enough go off. From there, low-cost staffers filter out the false alarms and escalate to a core team for manual analysis. This makes the most sense. I mean, if you were Google, building the greatest SE on the planet, it makes sense to automate as much as possible, create tools to collect flags and let low-cost staffers check these flags and escalate or ignore issues, and then have a core team do manual reviews to find areas to improve in the SE code.