First, you're mixing up capabilities of PWA vs native apps (no one stated they're equal) and how an OS presents Apps differently from PWAs (which was my point).
Second (even though it's completely beside the point), especially Liquid Glass could be implemented in PWA, because it's a rendering effect the OS could put on top of appropriately tagged elements of the application. And voila, the same webapp could render in Liquid Glass in IOS26 and in less-gaudy Liquid Glass in IOS28, and meanwhile in no Liquid Glass at all on devices that don't have it...
Second (even though it's completely beside the point), especially Liquid Glass could be implemented in PWA, because it's a rendering effect the OS could put on top of appropriately tagged elements of the application. And voila, the same webapp could render in Liquid Glass in IOS26 and in less-gaudy Liquid Glass in IOS28, and meanwhile in no Liquid Glass at all on devices that don't have it...