No, I think the article makes it very clear what the value and function of SRE is. The point of the comment you're responding to is that the author was the only one doing this—not a team of ten, not even a team of two. This is Twitter's whole cache system! Probably the most important part of their hardware stack, in terms of "is the site performing well for users". There are other SRE needs at Twitter, but not that that many. What were the other 9k people at the company? It begs the question.
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