Again, nothing to see here. Opera Blink is relatively new so we are just going to go with the default set of options for now.
You don't need to use any of the desired capabilities described earlier; however, I have found them to be useful in the past, and I now use these as my default set.
If you don't want to use them, just remove the bits you aren't interested in and set up each getDesiredCapabilities() method like the FirefoxDriver one. Of course the opposite is also true; you can add in any desired capabilities that you nd useful in your tests. This is going to be the place that instantiates a driver object so it's the best place to do it.