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Because new content is the only lever anyone measures. An archive of thousands of articles decays quietly, and nobody knows which of them are one edit away from being useful again.
So the answer to falling traffic is always more articles, which is the most expensive available option.
Each article is a record with its own performance curve and edit history, so decay is visible per piece rather than as a site-wide trend.
The refresh queue is ordered by what an article earned, what it earns now, and what the cluster it answers is worth.
It will not write or update the article. It says which one and what it is missing.
It also will not judge editorial value — an article that earns nothing may still be why people trust you.
Refreshing beats publishing on a measurable basis, and the queue says which pieces.
Cannibalisation between years of coverage on one topic becomes visible, which on a large archive is often the biggest single loss.
Yes, per article and per section.
Yes, as page records like any other.
Where your analytics supplies revenue per page, yes.
Half an hour on your own numbers is usually enough to say whether Growth is the right place to start.