What’s interesting is that NeXT and Apple dropped the ball on essentially all of that stuff. IB was never as nice to use for UIKit as it originally was for AppK

What’s interesting is that NeXT and Apple dropped the ball on essentially all of that stuff. IB was never as nice to use for UIKit as it originally was for AppKit. Bits of EOF made it into macOS (I think this was the origin of KVO?) but as I understand it, most of it went into WebObjects, which got ported to Java and eventually end-of-lifed. If IB had kept up with UIKit/CoreAnimation/Autolayout — or the frameworks had made sure to make IB an integrated part of those features, I’m convinced that SwiftUI wouldn’t exist because there would have been no need.