I hadn't seen them laid out so clearly before, but now that I have, all I can say about the original Windows 10 icons (middle row) is oh my god.
Seriously, what happened here? When did we go completely off the rails and let pea-brained designers start throwing this kind of bullshit around, calling it "modern" and "clean". No shit it's clean -- that recycle bin probably took all of 30 seconds to draw with the Line tool. No, faster probably, since they were just pulled out of the Windows 1.0 archives.
I look at those three rows of icons and truly cannot fathom why someone would ever choose (especially) the second or third rows. They're low contrast, simpleton drivel that doesn't even do a good job of representing the objects they're trying to depict. Whoever created them should be fired, along with the manager that approved them.
In fact, Microsoft would be well-served by firing the whole damned "UX" group and replacing this new-age cargo-cult mentality of user interface design with a scientific approach of usability studies and research. You know, that thing they used to do. Let Google and Apple waste their time with that hipster crap if they want to -- normal people and business just want to get shit done and you don't get off on the right foot to do that by making all your icons indistinguishable pale pastel blobs.