Loading dynamically named scene

To make it 100% dynamic, you can even use the dynamic import() statement. See code splitting with webpack.

create() {
  let someCondition = true

  if (someCondition)
    import(/* webpackChunkName: "mainScene" */ './mainScene').then(mainScene => {
      this.scene.add('MainScene', mainScene.default, true)
    })
  else console.log('The mainScene class will not even be loaded by the browser')
}

Edit:
I have just added support for it in both of my templates.