The point is that with EU mandating alt-browsers on iOS, it should have been a possibility to have "Installed" (home-)PWAs where the engine is the alt-browser, not safari/webview.

Those browsers could have implemented the Home-PWA functionality while maintaining your ability to install plugins such as adblockers within that PWA's context.

Apple has made this impossible by removing the OS APIs that allowed "Installed" (home-)PWAs entirely. This is just so they aren't forced to allow these under a different browser engine.

Of course, this is all done because "think of the children" (i.e.: think of the poor people ticked into using a non-privacy-respecting browser to run their PWAs).