This is a fairly niche case, but for Destiny players, DIM (Destiny Item Manager) is pretty indispensable and is a great PWA. https://destinyitemmanager.com/en/

On a more serious note, despite Apple's attempts to hobble/kill PWA, it is a very important platform for serving platform-agnostic apps not bounded by a walled-garden. Call me cynical, but the future is looking increasingly authoritarian, with governments everywhere calling for _less_ computing freedom. It is a terrible time to try to hobble this technology.