Ha. Using Foundation, Swift and SwiftUI I can write an app that doesn't require a trip to GitHub or Node.js in order to work properly. I can prototype my UI right there in Xcode, and if there's something I need that hasn't made it into SwiftUI yet I can bring in things from UIKit without very much effort. Best of all, I can build for macOS as well as iOS from the same codebase now. It's really hard to get more developer-friendly than that, unless you mean "web-developer-who-doesn't-want-to-learn-iOS-friendly".