Splitting a long FAQ into pages helps index when each question carries its own search demand and a distinct intent, because giving that question a focused page lets it fully answer and rank for its query, whereas a giant combined FAQ buries each answer and makes the questions compete with one another. The help is conditional on the questions being genuinely separate searchable intents. When they are, one-question-per-page works; when they are not, splitting just fragments a page that was fine as it was.
The mechanism is each-question-has-its-own-demand. A page ranks best when it has a clear, single intent it answers completely, so a question that people actually search for deserves a page that is unambiguously about that question, with room to answer it fully and earn the relevance and snippet that intent rewards. Stuffed into a long FAQ, the same question becomes a short blurb among dozens of unrelated ones, the page’s intent is diffuse, and Google struggles to read it as the right answer to any one of them. Worse, several FAQ entries chasing overlapping queries on a single URL can compete with each other for the same intent, so none ranks cleanly.
This is why the help only appears under the condition. If the questions on a long FAQ have no independent search demand and no distinct intent, splitting them produces thin pages that earn nothing and dilute the site, which is why “always split FAQs into pages” is wrong. And keeping everything on one page is equally wrong when individual questions each have real demand, because then the combined page is leaving rankings on the table. The deciding factor is whether each question is a standalone searchable intent, framed by what is observed when sites split high-demand questions out.
So audit your FAQ before splitting it. Identify which questions have genuine, independent search demand and distinct intent, and give those their own focused pages, while leaving low-demand or closely related entries grouped where they belong. Split out the questions that can stand and rank on their own, and leave the rest together.