I watched the how-to video and did find this feature useful. Inspired by this, I created a plugin that emulates this behavior:
https://github.com/gregsadetsky/NewFileFromScope
(installation instructions appear in the plugin description text, near the bottom)
Shortly, this plugin adds a "New File From Scope" command to the Command Palette which will pseudo-smartly try to extract a file name from the current scope, and create a new file named correspondingly.
For instance, if you have the following line:
<link href="app.css" rel="stylesheet">
placing your cursor anywhere in the app.css text (or selecting it) and invoking the command will create a new, empty file named "app.css".
Enjoy!