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In what way was this a tutorial? Seemed more like a parable meant to drive home the line about how "When they have questions, they ask the mailing list or read the faq again."

Each problem poses different challenges, and it doesn't seem fair to attempt to invalidate a given example by theorizing about hypothetical complexities the original authors never alluded to.

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You misunderstood the intent of my possible continuation of the original post. I was not trying to invalidate it, but just noting what problems might (and do) arise.

I totally agree with all the article says. Caching in general and especially memcache are awesome, but as always it's a trade off. What you get in performance, you pay for in complexity

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