Sort of but not really. SwiftUI is reactive, with view changes triggered by changes in Swift variables and those changes triggered using Combine. The later iterations of Swift include async/await to greatly simplify async code (normally but not always focused on network endpoints). You can write everything you need without having to drag Kotlin into the mix, and including Kotlin will require bridge code that seems (to me, at least) an unwanted obligation just to let some executive say "We saved some money by sharing code!".

No no no. Just look at the janky stuff one needs to do to compile Kotlin for an iOS project. Plus, object lifetime semantics differ. Now you won’t be able to write Kotlin native code without thinking of iOS rules. So now you have the worst of unfamiliar worlds with a “most fast” product speed.

im not a phone app dev, but im curious, cant you already write backend code in another language and the ui in swift