That tripped me up for a few minutes. I decided that since the author is using we in the singular not plural so it is that person's experience only and not mean

That tripped me up for a few minutes. I decided that since the author is using we in the singular not plural so it is that person's experience only and not meant to be a blanket statement. Also, I can only assume that the author meant a touch screen on a phone and not, say, a touch screen on a laptop because I can't imagine how that is difficult on someone's hands.