This is a really bad idea. Period. Being forced to use the customizer to work on menus and rearrange content is very counter-productive. These "updates" are not necessarily helpful, as we found out with 4.2.2 which destroyed the ability to display comments on some themes, 2010, 2011, 2012 which brings on the WSOD and a blank 'comment-php' page.--a problem STILL unresolved. Imagine now, a new update, with all content painfully arranged, and some WP genius with nothing better to do decides to "update" the customizer. BAD idea.