This was actually pretty neat back in the wild west days of single page web apps. Standard practice at the time was to assemble 'Web 2.0' apps using a combination of jQuery, duct tape, and hope. So seeing a language + framework combo (Cappuccino and Objective-J) that would let you construct your app's UI using OSX's Interface Builder and then write your application in something other than Ecmascript 3.0 was actually a breath of fresh air, even if it seems a bit crazy now. And I still wonder if they were onto something here. I still like 280Slides better than Google Slides and PowerPoint Online now, more than a decade later. FWIW, SproutCore was another framework that aimed to do kind of the same thing but using plain JS. In some ways, it was a progenitor of things like Angular and I still like some aspects of it more than Angular and React. Heck, I would actually love a modern take on this that lets you build your UI with XCode/Interface builder, then write your code in Swift and compile it all down to WASM. I think there are tools that already let you do something similar using XAML and C# compiled to WASM.