I used Cocoa on iOS and I agree that it's easy to build an app matching the platform UI guidelines. When using the storyboard designer it's ridiculously easy.

I used Cocoa on iOS and I agree that it's easy to build an app matching the platform UI guidelines. When using the storyboard designer it's ridiculously easy. Qt gives one a lot more freedom to screw up and look out of place if they're not careful. But when one wants to customize controls or build a customized UI Qt will win hands down. The problem with Linux UI has nothing to do with Qt per se. Qt is more than able to build high-quality UIs, but as long as Linux is lacking a UI identity (like Unity, which many hate) it will never be as good as macOS.