UWP is an attempt by Microsoft to sieze control. It is a self contained file system that provides privileged access to API's while isolating the files in a container whose contents cannot be accessed. In addition to this UWP is 'portable' but it is also locked down and while the method of distribution is largely irrelevant, it is controlled by Microsoft.
UWP also has significant limitations, firstly (and I'm not certain if this has changed) Games do not run in fullscreen, they run in borderless full screen mode, meaning the game does not lock the screen for exclusive use this can have an impact on render performance. It also imposes hardware restrictions too in that SLI is rendered useless in UWP titles; etc... It is not simply 'a method for ensuring that "application written for Windows 10 can also work on Windows 10 mobile without having to be ported to it"
UWP is simply an attempt to transfer control from the User, you cant peer into the UWP container and your ability to utilise hardware features of your PC is dictated by the container. There is also some concern that in the future Microsoft may deprecate Win32 in favour of UWP, now, while I doubt that Win32 is likely to disappear the concerns remain and they are valid. It is quite likely that feature development will favour UWP over Win32 moving forward.
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