Within a services API (rails-api for instance), you may have a need to execute different simple_commands or your own custom commands (service objects) based on one or more factors: multiple application, API version, user type, user credentials, etc. For example, your service API may need to execute either Api::Auth::V1::AuthenticateCommand.call(...) or Api::Auth::V2::AuthenticateCommand.call(...) based on the API version. simple_command_dispatcher allows you to execute either command with one line of code dynamically.