JPATH_BASE and redundant _JDEFINES in index.php

Where sense define custom JPATH_BASE in custom defines.php? Then, if move plugins/modules/etc dir, site will be broken and joomla update process not will be worked correctly. Also .css and .js from many plurins and modules, whatever, load from root "/" url.

Custom JPATH_BASE in custom defines.php - ok... And why define redundant _JDEFINES constant, when you can just use "if(){}else{}" construction? when defines.php must be included in any case!

#8281

index.php

@@ -21,15 +21,12 @@
  * define() is used in the installation folder rather than "const" to not error for PHP 5.2 and lower
  */
 define('_JEXEC', 1);
+define('JPATH_BASE', __DIR__);
 
-if (file_exists(__DIR__ . '/defines.php'))
+if (file_exists(JPATH_BASE . '/defines.php'))
 {
-	include_once __DIR__ . '/defines.php';
-}
-
-if (!defined('_JDEFINES'))
-{
-	define('JPATH_BASE', __DIR__);
+	include_once JPATH_BASE . '/defines.php';
+} else {
 	require_once JPATH_BASE . '/includes/defines.php';
 }