In reply to Sarah Gooding.

I would love to see this happen and would definitely adopt it for my theme collection. For a user, setting up a new theme can be quite the runaround. Even if it's a simple theme, there are so many menus to jump through just to get going. It would be great if users could setup their theme from within the Customizer without having to leave to go to the Widgets page. Change a few settings, add a few widgets and get back to adding content. That's how simple it should be.

The last update to the Widgets page was a nice iteration, solving some of the common annoyances with widgets. However, the Widgets page is still cumbersome to use, in my opinion. Maybe this could alleviate some of the remaining UX hurdles.