It also allows you to apply the package rules to template sites – which means you can create sites that contain most or all of your plugins and themes and then use Site Packages to control which are activated and deactivated for each plan/product.
When you create a new site, all rules are applied immediately. Which means that if you have a lot of rules (eg.: you have a lot of plugins/themes that need to be installed and/or activated), you might run into a PHP timeout or CloudFlare timeout issue.
A site package can only be applied to a new WordPress site – not a clone or staging site. However, when integrated with WooCommerce, site/product packages can be applied to products that use templates.