Who takes care of QA both for the WordPress CMS and its Plugins
Release 3.7.1 came out just a week from 3.7 because of shortcomings.
Debugging a plugin produced a message related to a WP file.
"Notice: get_theme_data is deprecated since version 3.4! Use wp_get_theme() instead. in /sites/..../...../wp-includes/functions.php on line 2919"
Even though it's just a warning I would say that these messages should be there. The CMS files should be checked and officially certified.