In reply to Weston Ruter.

This ticket has been opened for 19 months now and still nothing has happened with it. People have been begging for the Customizer to resizable since it was first implemented, back in WordPress 3.x, and still nothing has been done. The Customizer, in it's current form is definitely not going to help get WordPress usage over 50%. Instead of just constantly trying to push more and more functionality into an already poorly designed feature, the existing experience needs to be improved if you want people to actually embrace it.