I thought I'd have a play with static file caching, and I have a fundamental question about how it works. If I enable it, Statamic starts generating content in the static folder just as I'd expect. But, of course, it's not served from there until I enable the rewrite rule in web.config (IIS server!). But then the site 404s for pages that aren't yet in the cache, since nothing is routed to PHP. Seems like a dichotomy?