Earlier quoted context omitted.
Windows 10 S has all the CLI stuff disabled, including WSL. The registry editor is also absent.
How aggravating. This is why I left Windows. No marginal cost to them, the functionality is inside but turned off . I really have a hard time with that idea. It seems...well...just plain mean.
It seems like the intent is to end up in a similar place to iOS, with the entire system "curated" end to end. Which is not a bad place to be for many (most?) users. The problem with iOS model is that there's no way to escape it for power users, but it looks like it's not the case here - you can run 10 S if you want iOS-like experience, or you can run 10 Pro otherwise.