Framework builder plugins are basicly the same as using require_once to add one page to another, the difference is that with plugins, the page being added is parsed into the pieces above the doc type, in the head and in the body of the page. When added to the main page, the piece that is the code above the doctype is added above the doctype, the piece that is the code in the head is added in the head, and the piece that is the code in the body is added in the body.
because it breaks the original page down into the pieces and adds the code chunks to the appropriate places, it prevents the issue you experienced where the redirect doesn't work.
framework builder is a power tool that allows you to create page with pieces of functionality like a log page and re use them in multiple parts of the site.
