In Xcode 15.3 beta I see a deprecation warning in a newly created Flutter iOS Xcode project. @UIApplicationMain was renamed to @main in Swift 5.3.

AppDelegate.swift:4:1 'UIApplicationMain' is deprecated; this is an error in Swift 6

We already require Xcode 14, and Swift 5.3 was introduced in Xcode 12.

I bet the same is needed for @NSApplicationMain but I didn't check.

I'm not sure if there are other implications to using @main instead of @UIApplicationMain (scene delegates?)