Won't allow what? All the Safari features this article is talking about are already present on the Vision Pro, and they've also already been improving their PWA

Won't allow what? All the Safari features this article is talking about are already present on the Vision Pro, and they've also already been improving their PWA support in recent macOS/iOS releases. The questionable bit is whether they'll change their tune on browser engines on iOS/visionOS, but that's not essential for the article's argument.