PWA Studio = "works as a mobile app"? Is that the killer feature?

Sort of, but the framing is misleading. PWA Studio ships a Progressive Web App by default, installable on Android home screen, offline-capable for cached routes, push-notification ready. It’s not a native app, it doesn’t ship on the App Store / Play Store on its own.

To get a real native app from PWA Studio you wrap it with Capacitor or React Native. That works because the React frontend is already built, but it’s a separate engineering effort with its own App Store review process, push-notification infrastructure, and platform-specific UX.

Hyvä can also be installable as a basic PWA (service worker for offline, manifest for home-screen install), that’s a separate Hyvä module. What Hyvä can’t do is share its frontend codebase with a native app on App Store / Play Store. That capability is the real PWA Studio differentiator. If you don’t need it (and 95% of stores don’t), the "mobile app" framing isn’t worth the 8x cost.