You get notification. You can autoplay video/audio. You get whaterver video or element full screen with all necessary UI. You get rotation lock. You have a fullscreen to do what ever you want for any purpose. You probably can't touch hardware APIs(for example: bluetooth/nfc) like native app. But that isn't really needed for most apps either.
On the other side. Apple seems sabotage the PWA as much as possible. You can't autoplay video/audio. You can't even fullscreen anything other than video, and when fullscreen video, UI is ignored. Also there is no way to disable gesture so your app will misfire system gesture. And you can't lock the rotation either. There is no way to auto rotate the video player or whatever when maximized either.
It's really a golden example for pretend to do something while actually not. It seems you can do pretty much everything with ios pwa. And when you try to do it. You will figured out it will have a worse experience than native app because all sort of issues.