I completely agree, although not perfect, for me this app is the first time a PWA has felt close to a native app.

Like you say, without attention and development in this area, it will be ignored (or at least de-prioritised) and languish. If some of the rough edges can be smoothed by Apple, then an growing number of users and increased attention is more likely to influence them to prioritise improvements.

Apps like these are the best thing that could happen for the platform.

Optimistically, it could be a win-win: Apple are really against third-party app stores, so web apps have been their go-to example showing the "openness" of their platform. If we get a thriving web app ecosystem on iOS, then it should benefit both the users and Apple.