Build a small Grav site section with a few Markdown pages, images, navigation, and the plugins you would need in production. Have an editor update a page through the intended interface, then verify the generated URL and mobile view.
Flat-file content is attractive for portability, but themes, plugins, and deployment still need maintenance. Version the site files, rehearse an update on staging, and restore the site from backup. Judge Grav by the full publishing workflow, not just its lack of a database.
Akousa