Owen on "[Plugin: Jetpack by WordPress.com] what happened to the old css editor?"

Hi,
Recently updated to the latest Jetpack version and I love the new features. However I prefer the old css editor as it put up warnings and gave me helpful info and lots more. What happened to the old one? Why was it changed?
Here is my site if you need to look at it.

http://wordpress.org/plugins/jetpack/