the reason on the bottom right is very true IMO 😀
at first I thought "wel, they worked a logn time on it, it can't be reallty that bad, and, aftetr all, they have some good examples to copy from (cough, OSX, cough, Linux... 😛), so it must be something good, right? well, apparently NOT. They tried so hard to make it look plain and simple like OSX, but they didn't get that quite rught: they removed the most-used layout of all: the file-edit-view-interface even OSX and linux are using!
even title-bars are being removed in explorere windows.
So yeah: there is no commercial competition 😛