I think the key thing here is Google "following". Google have their own fork of WebKit, they can implement pointer events if they so choose, and they also have

I think the key thing here is Google "following". Google have their own fork of WebKit, they can implement pointer events if they so choose, and they also have a far, far larger share of the desktop browser market. Except for on mobile Apple are a minor player, and even on mobile Google is still the major player.