The task is actually to decide if client-side navigation is better than regular navigation.
It's a delicate quest that has one foot in web performance and one foot in a11y.
Whatever we decide, if the evidence is good, we should consider this for the other places where we use <Link> which is the breadcrumbs and the autocomplete search results.
@schalkneethling Given the potential improvements to the <Link> with the <PreloadingDocumentLink> component we might reconsider.
We'd need to be aware of this for each link in the header. I.e. whether it links to a document or to some other page that doesn't have a index.json state file.