Passionate IT skills on the run: keep calm, do your stuff and code better
Keep using Storyboards if your app is simple and you don’t need complex navigation patterns or to pass params to the next controller.
Maybe you should also say that just removing the reference to the storyboard is not enough. Inside the method application(_ application: didFinishLaunchingWithOptions:) a viewcontroller must be set as root of the main window
Why the MEAN stack is a very interesting stack