For problem areas where Apple's frameworks provide a useful or necessary solution, accessing them from Objective-C instead of Swift is more stable. Examples like Accelerate, HealthKit, and StoreKit come to mind.
For problem areas where Apple has no advantage but you want to ship code there, oft derided but broadly usable solutions like C++ (which connects to Objective-C better than it does to Swift) or Javascript dominate.
Even Apple appears to struggle at drinking its own koolaid, given the recent criticism of the Settings port to SwiftUI. [2]
[1]: https://www.joelonsoftware.com/2004/06/13/how-microsoft-lost...
[2]: https://daringfireball.net/linked/2022/08/15/ventura-system-...