Possibly naive question, but do we have user research or stats that demonstrate how often people customize the look of their sites? I've always felt that you design a site, launch it and then got on with the business of the site, whatever that is.

I can see a fair amount of tweaking early on to get things right and adjust things that you might have missed in a first pass, but it rather mystifies me that people seem so fixated on the Customizer and related issues.