It includes config for yoast seo because almost everyone use it and without those rewrites, sitemap will not be displayed properly. But feel free to check all the files in the folder to common to understand all the work EE does for you, and to edit them if needed.
Tech spec
NGINX HHVM WP-CLI COMPOSER REDIS / MEMCACHE W3TC / SC / FastCGI Cache / Varnish SSL - Lets Encrypt PROXY PHP 5.6 / PHP 7
You dont need to bother about any setup, just choose the stack of your flavor and EE will do the rest.
Personaly i made my favorite “recepie” and is provisioning a new wp + optimized stack in seconds.