12.6.3 Concentrate on critical aspects of the driver
Often people focus on what they can easily see of a driver, which tends to be the browser, not the actual driver. However, with HII functionality, a driver no longer needs to include its own browser. Instead, the driver can take advantage of the platform's browser and other code already written and a part of the platform.
TIP: Concentrate on the important parts of the driver (what it does), not on the more visible, probably browser-related, aspects. A UEFI 2.x conformant driver uses the platform's existing browser anyway