Author here, speaking only for myself, sometimes you're right, and I do want to create a new Next.js app, deploy it to our internal Kubernetes cluster behind our corporate intranet with all the credentials and so on.

And sometimes I don't! Sometimes I just want to add a graph of customer churn from a ClickHouse query directly into a PRD, and just say who has access to run it, so the proxy can enforce it. Or I want to put a release button into the document that documents the release process. Sometimes I want a collaboratively-editable document that just happens to be enriched with a little bit of personalized UI.