Many low-volume pages add up to real authority when they cover a topic’s full question space coherently and link to one another, because the value comes from coverage that compounds, not from the raw page count. A pile of unconnected thin pages signals nothing. A set of pages that between them answer every reasonable question a topic raises, and that point to each other so the connections are visible, signals to Google that the site understands the subject in depth. Each small page is a brick, and the wall is what carries authority.
The mechanism worth holding onto is coverage-coherence-compounds. Coverage means the cluster leaves few obvious gaps a curious searcher would feel. Coherence means the pages are organized around a clear topical center and interlink so the relationships are explicit rather than implied. Compounding means the whole becomes worth more than the sum of its parts: a strong page lifts the weaker ones it links to, topical signals reinforce across the set, and the cluster as a unit starts to outrank looser competitors. The compounding is the real signal, and it only appears when coverage and coherence are both present.
This is why page count alone misleads in both directions. Publishing a hundred disconnected low-volume pages does not build authority, because nothing compounds; the pages just sit there as isolated, individually weak entries. At the same time, low-volume pages are not worthless, because a single one that slots into a coherent cluster pulls more weight than its own search demand would suggest. The unit that earns authority is the interlinked cluster, and a small page earns its place by reinforcing that cluster rather than by standing alone.
Treat your low-volume pages as one connected cluster rather than a list of separate posts. Map the full question space of the topic, write a focused page for each genuine sub-question, and link them so the structure is plain to both readers and crawlers. The authority shows up when the coverage is complete and the pages reinforce each other, so build for the cluster, not the count.