Earlier quoted context omitted.
PWA are not a standard, they are a Google concept pushed through Chrome (OS). I’m fine with Apple never supporting it.
PWA is a Google term, but the whole web app thing is older than even the native app store on iPhone.
Unfortunately, the term has been co-opted to mean "website I can install/pin as an app". Again, Google is probably to blame for this, but AFAICT it was never meant to be the meaning of the term. What it does do is create misunderstandings, like a sibling thread claiming that (desktop) Firefox doesn't support PWAs because you can't install anything.
[1] https://developer.mozilla.org/en-US/docs/Web/Progressive_web...