Another thumbs up for WP at least making grounds to unify the customizer for developers. To many theme developers went off the deep end on their own development 'widgets', creating some pretty terrible final code output in the end. Frankly I'd rather develop out themes with the base CSS for cleanliness... but i know there is a need to accommodate non-coders.

I do wish that WP could work something out so that CSS in the customizer could be concated to the theme style sheet (or css file of choice), rather than having to the wp_header. If someone knows of a framework that does this, it would be appreciated!