🎗 Reminder that starting with iOS 12.2, it's possible to use Swift without incurring size penalty of bundled Swift runtime libraries.
Swift apps no longer include dynamically linked libraries for the Swift standard library and Swift SDK overlays in build variants for devices running iOS 12.2, watchOS 5.2, and tvOS 12.2. As a result, Swift apps can be smaller when they're shipped in the App Store, deployed for testing using TestFlight, or thinned in an app archive for local development distribution.
From Xcode 10.2 Release Notes via this StackOverflow answer.