PWAs are pretty great, but not the ultimate answer, sadly. That is partially due to support and partially due to limitations. Therefore, in most cases, people will develop native apps instead to make it work. On Android, this is pretty easy - if the Play Store rejects you, just install the APK. Not so much on Apple, yet.

I forgot the exact limitations that PWAs are restricted by, but I think one of them was notifications and registering custom URL handles.