A thin service page is a URL that has a heading in the menu and no answer for the buyer. Three sentences about services, a stock photo and a generic contact form are not an enquiry page. The buyer asks what is in scope, who it fits and how the work starts.
Thin is not a word count
Adding eight hundred words does not thicken the page. Thickness is a concrete answer to the one question on the page: what is delivered, what is not, who decides, and what you need in the first thirty minutes. Without that answer the copy is decoration.
The four questions a buyer asks
Scope. Boundary. Who answers. How it starts. If those four are missing, the page is a note, not a service record. HED Creative reads the page against those gaps. A line called write the content is not opened before the gaps are written down.
A blog does not cover a thin page
Publishing posts while the service URL is empty adds a second door on the same intent. Google still sees a thin service. An answer engine still finds no claim to cite. The service record answers first. The article supports that record.
Schema does not replace the answer
FAQ schema points at a question that actually stands on the page. Invented reviews, fake stars and an empty organisation block do not turn a thin page into a rich result. Schema is the machine face of a fact you wrote. No fact, no schema.
The reading needs the service URLs you suspect are thin, and the question sales cannot answer from that page. A word-count target is not written.
Which service URL carries no answer is listed in the SEO agency brief. If the page has to be rewritten, website development is the same job. The paragraph a citation needs: citable company page.