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Ranking individual pages is vitally important in the website traffic game.

Suppose Mozilla's goal for its blog is to generate a lot of organic traffic so that people are aware of Moz Corp's continuing development efforts. If that were the case, individual ranking of pages matters.

A domain name has a certain "rank," that's based entirely on on-page SEO -- or all of the indexed pages and site as a whole -- and off-page SEO -- or all of the domains and pages that link to it.

One of the algos in determining on-page SEO is cumulative ranking of all pages under that domain. That is, a single page's ranking is not an isolated variable based purely on that page and its content alone. The other pages that fall under that same domain impact every other page on said domain.

If Mozilla published a poorly SEO'ed blog article, that would negatively affect the ranking of all other articles under the blog.mozilla.org name -- and more severely any other pages that link to it or are linked inside of it.

That's only the first part. Suppose they wanted to generate traffic for this individual press release? Then that's a whole nother ball of wax.