SWIFT WAS ALWAYS GOING TO BE PART OF THE OS

Summary from the TLDR Web Dev newsletter

Swift's inclusion in Apple's operating systems has benefits such as not requiring apps to embed Swift libraries. However, it also creates challenges such as the inability to remove or change APIs without affecting existing apps. Alternatives to Apple’s approach, such as library deduplication, explicit "polyfill" support, and explicit backwards-deployment support, improve the developer experience and help manage the evolution of Swift in the OS.