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They're dependent on the Windows Runtime API's from Windows 8.1 or 10.

You can't use WinJS with Windows 7.

JS is overwhelmingly edited in text editors, see Sublime, Coda, VIM, Emacs. Comparing to C# in this regard is not a good one. I find code completions / intelligence for JavaScript is very basic compared to something like C#.

Sure, and I accept that. But I would at the very least like to be able to open these files in Visual Studio and inspect them. It doesn't even let me to that much. It just gives me a lame error message about how I have to upgrade to Windows 8.1.

You know what? I see what you mean. I just found that...it's using a windows store app as a test harness.

They should also publish a sample website demo project for the rest of the planet that isn't using 8.1.