The author gives two examples in Slack and Spotify and it's pretty apparent why Electron is better than a browser. During screen sharing calls in Slack, it can

The author gives two examples in Slack and Spotify and it's pretty apparent why Electron is better than a browser. During screen sharing calls in Slack, it can capture the user's mouse and control a remote user's desktop. With Spotify, it can cache gigs of mp3s to save on bandwidth. I don't think either of these features are possible with a standard browser because of sandboxing, nor should they be allowed.