> Have you ever tried to implement drag and drop, animations (like accordions), modals, gradients, and custom elements?

not to sound like a salesperson but its not too hard in (apple) appkit [1] using cocoa and core animation [2]

(and all of this is even easier in swiftui especially animation and styling [3])

[1] https://developer.apple.com/documentation/AppKit/drag-and-dr...

[2] https://developer.apple.com/library/archive/documentation/Co...

[3] https://swiftui-lab.com/custom-styling/