Extension of the touch sensing aspect of the phone screen, not the display aspect. Extending one without the other leads to over-engineered pause buttons, is what the parent comment was saying I think. When the number of unlabeled buttons get much higher than 1, people start to get confused.

I agree in part, just think that the jacket needs to be paired with a HUD or maybe have control/button labels that can shine through the fabric in order to open up that innovation.