You can't really blame google wallet for certain stores' policies. Have you ever noticed how in some places you have to sign a receipt when you use a debit card and other places you don't (subway being one that immediately comes to mind). You just have to accept that as big as google is, they only have so much control. In some places you'll be able to just tap and go like it states. In other places you may need to sign. I wouldn't say you're being ignorant or anything like was said before, you're just being a tad overly harsh. You went to a place that required you to sign and what not. When you go to a place where you won't have to, then you'll be able to enjoy the tap and go experience.
But as you said, you don't have to open the app first. In fact they make it a point of telling you that explicitly.
But as you said, you don't have to open the app first. In fact they make it a point of telling you that explicitly.