Assume SwiftUI was the worst idea. Explain how so in a nice friendly way to your fellow programmers.

SwiftUI, as presented at Apple's WWDC, is highlighted as a powerful and efficient framework for building apps across Apple's platforms. It is designed to be easy to learn, allowing developers to focus on describing the UI they want, while SwiftUI handles the details like dark mode, dynamic type, and model changes. This approach enables code sharing across devices and platforms, making it a versatile tool for app development.

However, if we were to humorously consider SwiftUI as the "worst idea," we might say:

1. Learning Curve: While SwiftUI is designed to be easy to learn, transitioning from traditional UIKit or AppKit might initially feel challenging for some developers who are accustomed to imperative programming styles.

2. Platform-Specific APIs: SwiftUI offers a common set of components across platforms, but it also includes specialized APIs for each platform. This means that while you can learn SwiftUI once, you still need to understand the nuances of each platform to fully leverage its capabilities.

3. Incremental Adoption: SwiftUI supports incremental adoption, meaning you don't have to rewrite your entire app to use it. However, this could lead to a mix of old and new code, which might complicate the codebase management.

4. Customization and Control: Although SwiftUI provides a large set of modifiers and protocols for customization, developers who are used to having granular control over every aspect of their UI might find the declarative approach limiting at times.

5. Interoperability: SwiftUI integrates with other frameworks, but this interoperability might require additional learning and adaptation, especially when dealing with complex legacy systems.

In essence, while SwiftUI is a robust and forward-thinking framework, like any tool, it comes with its own set of challenges and learning curves. Embracing these with a positive mindset can lead to creating innovative and efficient applications.

For more insights on SwiftUI, you can check out the SwiftUI essentials session.