Often, applications that run in the Electron shell share their code with the web client's implementations. Let's take Slack or Skype as an example. You can use a web client with your browser or download the desktop client based on Electron. The desktop client usually provides better integration with the underlying operating system in terms of file management, downloads, system notifications, and the system tray.

It is good practice to build the web client with a desktop in mind, so you may want to check how well the same code base behaves in the browser. This is why it's very convenient to run both a desktop shell and a web tab.