Darn, even GNOME jumped on the let's-make-the-UI-flat bandwagon.
To be honest I'm lost for words here: what's pushing this trend to make the actionable items blend with the content in such a confusing way?
I understand modernization but I'd really love to get a UX designer point of view here: what's the problem being tackled away by flattening all the actionable items here? What are we gaining in terms of usability?