Recently, I have been seeing more and more examples of some kind of design style consisting only of rudimentary basic shapes, leaving out as much detail as possible. It's been used for many things, but mostly to illustrate UI.
The following examples could be classified as flat design, but I'm feeling it's not just that. Maybe it's a sub-style or kindred style? Can anyone help me put a name to this style? Maybe Flat Design Blocked? Or Flat without details?
Treehouse shows this a lot
Also Adobe has been using this style as of late in some of their help docs