Finding GOOD Java or Objective-C developers is much more difficult than getting JS developers. Moreover, the services of the first will cost you much more. If we add to this the fact that for each individual platform you need a separate team of programmers, it becomes obvious that you will require some pretty penny to implement a native application for both iOS and Android may be prohibitive.
Surely, a kind of compromise can be found in cross-platform or hybrid concepts, but then your dilemma will come down to picking between the PWA vs React Native (or any other JS library or framework) and additional converting of existing software will still be required. When you create a PWA, you create it ONCE for all the browsers and operating systems available out there.