I doubt that this is going to be an issue for applications using ReactNative or other solutions to package websites as applications.

For applications that have you add it to your home screen using the app icon, it may be more of an issue, but why wouldn't you sync that data back up to the server?

Yes of course if you're running a business then you're getting users logged in ASAP. There are other models of software development, however. Even if you're in the commercial sector, some users may be less eager than others to sign up for your fine service. Should you preemptively suck in their data, whoops I mean back up their data, without telling them? It seems there could be several responses to that question...

It's fine that Apple don't want to support this valid mode of app distribution and use. It is a valid mode, however.

Just FYI (If I'm reading you correctly): That's not how react native works. It's a native app, not a wrapped website.

I suspect they just meant regular react

Ok, that's not how React works either. React is not a "solution to package websites as applications".

you know .. you're correct, I misread his original post. He was probably conflating reactnative with something like Electron

so what is the modern version of PhoneGap?

Ionic Capacitor

Cordova?