Covers the topic in real depth

Whether the page answers as much of the searcher's question as the pages that rank for the target keyword do.

Depth is relative, not absolute. A 300-word page can be plenty for one query and hopeless for another - what matters is what the winners cover. When every ranking page addresses pricing, alternatives, and how-to detail and yours stops at a summary, searchers (and search engines) have no reason to prefer yours.

When this is flagged

The report flags this when the page treats the target topic superficially compared to the pages that actually rank - they answer substantially more of what the searcher evidently wants.

How to fix it

Study what the ranking pages all cover and close the gaps that fit your page's purpose. Add the missing substance - real detail, data, examples - rather than padding word count; length without new information does not help.