Earlier quoted context omitted.
>And in one fell swoop, Apple has made it effectively impossible to install this app on your phone. There's no realistic workaround. Make the app a Web App and visit it in Safari. Apple has banned it being notarized and distributed from their App Store but iPhones still have access to the conventional web which Apple has no control over.
Apple has been (I suspect purposefully!) dragging their feet on progressive web app support. There list of limitations is long, but most critically for this app (I would imagine), they can't send notifications and they can't work offline.
And anyway, a PWA should be actually progressive. If it requires all the features it’s the opposite of progressive.