It won't, for the same reasons that web apps weren't allowed on the App Store 15...

marcellus23 · on May 28, 2023

What does the App Store have to do with it? Apple supported adding web apps to the Home Screen from the very first iPhone OS.

cvan · on May 28, 2023

On iOS, go to Settings > Safari > Advanced > Experimental Features. (Or on macOS desktop, from the Develop menu.)

Scroll to the bottom of the list.

There are 4 WebXR APIs behind a flag.

Why waste precious WebKit resources on implementing WebXR APIs in Apple's browser engine… if WebXR will hypothetically never be shipped to Safari stable?