We got a free ShopRunner subscription through Amex and I was excited about that but they seem to be mostly for clothing.
But the biggest annoyance is that we no longer go straight to Amazon to buy something, we actually have to shop around, google for things, etc. And Google Shopping isn't as useful as it used to be. A good shopping aggregator would go a long way in helping.
Edit: We were frequent users of the shipping, by the way, and never used streaming. Unlike others that use mostly streaming and not shipping.