Is loading wp-load.php and admin.php in your popup acceptable?

I have seen plugins that include core and admin in a PHP popup. For example, when the PHP file does not otherwise have access to WP functionality, such as when included in a tinyMCE popup:

require_once(‘../../../wp-load.php’);
require_once( ‘../../../wp-admin/admin.php’);

Path issues aside, is it acceptable to include wp-load.php and wp-admin.php this way?

Thanks