The whole point of an advert is to show us the product it’s trying to get us to buy and to make us want it. So you can understand when designers try to show off the product to its best advantage.
Usually, however, you have to show the product in the way that it would actually be used. I’m no expert in the wonderful new world of Virtual Reality, but I’m pretty sure that, in order for the headset pictured to work, the user actually has to be looking at the phone screen. I’m sensing a problem here.