Why does Rails 5 edge version API-only app includes Sprockets and SAAS in Gemfile?

[Jiggneshh Gohel]

I have generated a skeleton-API-only app based on Rails 5 edge version using command:

      rails app_name --api --edge

Its Gemfile includes Sprockets and SASS gems as can be seen in it.

    gem 'sprockets-rails', github: "rails/sprockets-rails"
    gem 'sprockets', github: "rails/sprockets"
    gem 'sass-rails', github: "rails/sass-rails"

I was just wondering what purpose Sprockets and SASS should serve in an API-only app? Is it purposely done or by the time Rails 5 is officially released this should be fixed.

I also observed that when generated the Rails app the generator did created the assets folder, however removed it later as can be seen in the output shown below:

      create  app
      create  app/assets/config/manifest.js
      create  app/assets/javascripts/application.js
      create  app/assets/stylesheets/application.css
      create  app/controllers/application_controller.rb
      create  app/helpers/application_helper.rb
      create  app/jobs/application_job.rb
      create  app/views/layouts/application.html.erb
      create  app/assets/images/.keep
      create  app/mailers/.keep
      create  app/models/.keep
      create  app/controllers/concerns/.keep
      create  app/models/concerns/.keep
      create  bin
      create  bin/bundle
      create  bin/rails
      create  bin/rake
      create  bin/setup
      create  bin/update
      create  config
      create  config/routes.rb
      create  config/application.rb
      create  config/environment.rb
      create  config/secrets.yml
      create  config/environments
      create  config/environments/development.rb
      create  config/environments/production.rb
      create  config/environments/test.rb
      create  config/initializers
      create  config/initializers/active_record_belongs_to_required_by_default.rb
      create  config/initializers/application_controller_renderer.rb
      create  config/initializers/assets.rb
      create  config/initializers/backtrace_silencers.rb
      create  config/initializers/callback_terminator.rb
      create  config/initializers/cookies_serializer.rb
      create  config/initializers/cors.rb
      create  config/initializers/filter_parameter_logging.rb
      create  config/initializers/inflections.rb
      create  config/initializers/mime_types.rb
      create  config/initializers/session_store.rb
      create  config/initializers/wrap_parameters.rb
      create  config/locales
      create  config/locales/en.yml
      create  config/boot.rb
      create  config/database.yml
      create  db
      create  db/seeds.rb
      create  lib
      create  lib/tasks
      create  lib/tasks/.keep
      create  lib/assets
      create  lib/assets/.keep
      create  log
      create  log/.keep
      create  public
      create  public/404.html
      create  public/422.html
      create  public/500.html
      create  public/favicon.ico
      create  public/robots.txt
      create  test/fixtures
      create  test/fixtures/.keep
      create  test/fixtures/files
      create  test/fixtures/files/.keep
      create  test/controllers
      create  test/controllers/.keep
      create  test/mailers
      create  test/mailers/.keep
      create  test/models
      create  test/models/.keep
      create  test/helpers
      create  test/helpers/.keep
      create  test/integration
      create  test/integration/.keep
      create  test/test_helper.rb
      create  tmp
      create  tmp/.keep
      create  tmp/cache
      create  tmp/cache/assets
      create  vendor/assets/stylesheets
      create  vendor/assets/stylesheets/.keep
      remove  app/assets
      remove  lib/assets
      remove  tmp/cache/assets
      remove  vendor/assets
      remove  app/helpers
      remove  test/helpers
      remove  app/views
      remove  app/assets/javascripts
      remove  config/initializers/assets.rb
      remove  config/initializers/session_store.rb
      remove  config/initializers/cookies_serializer.rb
         run  bundle install

Thanks.