In newer versions of Swift the need for almost all prefixing has been removed. You can still say it's a facade when using things like UIKit, but as we've seen

In newer versions of Swift the need for almost all prefixing has been removed. You can still say it's a facade when using things like UIKit, but as we've seen in the past few years w/ SwiftUI that is changing. It's already no longer the case if you're doing anything related to heavy duty computation [Accelerate, Metal & others have Swift-specific APIs now] or networking [SwiftNIO].