Comment by alkonaut

WYSIWYG doesn't necessarily mean you are limited to using some designer and can't edit code. It's enough (and better) to have a live preview, than a full designer. It just means you see live what the code does, at the point when you write it, not later when you run it.

When hand-writing XAML or similar, it's great to see the UI created live. Like editing markdown and seeing the preview, versus editing markdown and not seeing the preview.