A large portion of apps on the mobile app stores are already built using cross-platform technologies like React Native, Ionic or Flutter. In some instances it is very easy to tell, in other it's not. You can create quality experiences using cross-platform, you can create awful experiences using native tooling.
In many instances, I'd rather have the not totally native app that exists than the absolutely perfectly native app that does not exist.
As for PWAs, I am personally all for it. I have so many apps on my phone that don't need to be an app in the first place. Why not make a great PWA experience rather than a mediocre mobile app? In terms of capabilities, PWA are perfectly suitable for the majority of usecases.
