Thank you!
The home icon because useful when you Outline > Focus In to a second of your outline. It helps in two ways… first it becomes dark and enabled, giving you indication that you are focused. And second it allows you to focus out to a higher level…
With that said I’m now in the process of adding better focus and navigation indicators and UI. These new features will likely make the home button redundant and I’ll remove it then. You can try out the new features in the 1.12 preview release: