I think the important thing to say is that there are already APIs which are SwiftUI only. This trend will definitely continue and in (near) future you won't hav

I think the important thing to say is that there are already APIs which are SwiftUI only. This trend will definitely continue and in (near) future you won't have much choice. While SwiftUI definitely lacks some finer customization of default elements (like the mentioned hairlines in the List/Form view), you can re-implement any UIKit view yourself in the end. Lazy loading is perfectly doable, I think the author could have shown an example on how to do the carousel properly with a full example of the UIKit code.