PWAs are great, since you can build native-mobile-app-like experiences.
Core features are:
- Installable on Homescreen
- Offline support with service workers
- Usage of various caching strategies
- Web push notifications
- Background sync
- Native device features like camera
- Way more...
PWAs really are awesome. And you can turn any application into a PWA.
Or simply start using some of the features that make up a complete PWA. That process is called "progressive enhancement" and what the "progressive" in "Progressive Web App" stands for.
Don't hesitate, dive into PWAs!