The user testing was more revealing about discovering where to customize stuff than issues with the site logo, at least from what I understood.

I'm just happy we're finally getting a core standard for this. Given the 100s of themes with their own implementation, it makes sense that core would standardize this. The concept has been well tested for years in themes (and Jetpack). It's a natural progression that core would get it, just like core standardized post classes, body classes, featured images, and other features that started out in the theme space. There's an obvious need for it.