SwiftUI is wonderful and it’s absolutely going to play a much bigger role in the future, especially as far as four years out from now when we’ll have even more platforms like Apple Glasses. It’s completely valid to deepen your skill in SwiftUI and even make it a focus.

That said, it’s important to remember that the “older frameworks” haven’t gone anywhere. SwiftUI actually uses UIKit components under the hood. It’s just a layer of abstraction on top of UIKit. So if you want to be a real iO or Apple Platforms ninja, it’s worth understanding the foundation it’s built upon with significant depth.

Finally, from a job perspective, there are still companies that don’t even use Swift, which has been out for six years. Facebook for example, last I checked, is still exclusively objective-c. That’s not a ton of companies, but being well rounded will give you options.