The benefit is consistent design and branding across platforms. They're not eliminating design that leverages the unique capabilities of each platform, they're

The benefit is consistent design and branding across platforms. They're not eliminating design that leverages the unique capabilities of each platform, they're standardizing inconsistent shared design. It says as much in the second part of the text you quoted: > making it simpler to explore common design approaches while still preserving relevant details about each platform