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Your point is good but I'm not sure I'd say very good given how easily the same SEO spam domains can stay at the top of search results for ages simply by scraping someone else's content. What I'd be most interested in knowing is what their success metrics are defined as — for example, how much of a problem does Google's management consider it if someone searches, finds the answer they were looking for on someone's St…
Yes, I've noticed this particularly with technical results. A lot of sites seem to have scraped StackOverflow and GitHub issues, put a crappy ad-loaded interface around them, and somehow out-rank the original SO/GitHub content. It's like the bad-old-days of ExpertsExchange, which somehow was never delisted by Google for its shady SEO tactics.
This is really what made me suspect that Google was teetering on the edge of the MBA death spiral: these problems run for years when they'd be easy to block, which suggests to me that whatever metric gets you a bonus / promoted doesn't include things like that which are long-term threats to their core business even if it's selling a lot of ads short-term.