Ambiguous difference between App.webroot and App.wwwRoot

The documentation shows them being essentially the same:

     * - webroot - The webroot directory.
     * - wwwRoot - The file path to webroot.

        'webroot' => 'webroot',
        'wwwRoot' => WWW_ROOT,

However, wwwRoot uses a path from paths.php wile webroot hard-codes the same directory in the config.

/*
 * File path to the webroot directory.
 *
 * To derive your webroot from your webserver change this to:
 *
 * `define('WWW_ROOT', rtrim($_SERVER['DOCUMENT_ROOT'], DS) . DS);`
 */
define('WWW_ROOT', ROOT . DS . 'webroot' . DS);

When would you want the webroot separate from the path? Asset loading from plugins don't use either of these, but instead hard-code the directory name webroot/ in source.

Review the documentation and paths.php definitions for App.webroot and App.wwwRoot, then trace the plugin asset-loading references to the hard-coded webroot/ path. Clarify when the two settings differ and how asset loading relates to them; done means the documentation gives an unambiguous explanation and examples.