A company website is mostly content that changes occasionally. Rendering it on every request is unnecessary work.
What static-first means
Pages are generated ahead of time and served as plain files from a global edge network. There is no application server to patch and almost nothing to attack.
Content without a database
When content lives in the same Git repository as the code, every edit is versioned, reviewable and reversible. A Git-based editor gives non-developers a friendly interface, while publishing is simply a commit.
JavaScript is a cost
Every script has to be downloaded, parsed and run on the visitor’s device. We ship JavaScript only where it earns its place, such as a mobile menu or form validation, and leave everything else as HTML and CSS.
Accessibility and search come with it
Semantic HTML, sensible headings and fast loading are the same fundamentals that help screen-reader users and search engines. Building them in from the start is cheaper than retrofitting.
When static is not enough
If a site needs per-user data, payments or heavy personalisation, a dynamic layer makes sense. For most company sites it does not.