@bc3tech:good question! Some of the .NET Standard 2.0 implementation is dependent on new APIs available in the Fall Creators Update. Even though the runtime is packaged with the app, it won't work unless all dependencies are available.
@Yuriy: Unfortunately profiling while debugging tools do not work on Windows Phone devices. You can use the dedicated Performance Profiler to test on a Windows Phone device or emulator by accessing the menu under "Debug -> Performance Profiler..." or using the shortcut (Alt + F2). I would recommend testing on a real device before publishing your app!
@jerocis: good news, we'll be changing the default behavior of the templates in the next release of Visual Studio. For your existing projects you will still have to turn off the frame rate counter, but when you install the next VS, new projects will not have it on by default.
We currently do not have any plans to integrate .NET Native with Powershell scripts; however, for C# developers building command line tools that want to take advantage of ahead-of-time compilation, we're building .NET CLI that is powered by what is called CoreRT. Some information can be found in the below links: