Folks pointing out that their Raspberry Pi self-hosted static site résumé can handle 500 requests per second are missing the point.
The Wordpress approach of dynamically composing every page server-side made sense:
* Before AJAX made personalizing the 'logged-in experience' easy even on a mainly static site
* When CPUs were so slow that regenerating, say, 1000 static HTML files just because you updated your footer or your "top stories" sidebar would take an annoying amount of time instead of what, 4 seconds now?
* Before spambots essentially made it impossible to host a comments section, and Disqus and the Facebook plugin became the defacto choice for anyone still brave enough to try.
Due to the above, I can't imagine using PHP or even some sexier-today technology to dynamically just-in-time assemble HTML pages that 99-100% of the audience will be viewing statically.
Wordpress should integrate one of those "Wordpress to static site" plugins as the default because that's all 80% of the users need.