Just a note to the editor, in the sentence "The beauty of the Chromecast is that your phone is not actually doing any of the legwork. You aren’t broadcasting Netflix directly from your phone to your TV. Rather, the Chromecast app sends a signal to the device, which handles the rest on its own."
It should actually be "Chromecast enabled app". The Chromecast app itself doesn't actually do anything but assist in setting up the Chromecast and show a list of suggested apps and content to watch. A Chromecast enabled app such as YouTube or Hulu or Netflix would be the app you're mentioning in the sentence.