Telling Google assistant to add items to your shopping list and them being added to a keep note titled "shopping list" was the original functionality in Google keep. I used this feature all the time which is great for someone like me who has ADD. Then without warning, Google decided to change the functionality so that it added the items to Google Express instead. It was a small change that caused a lot of inconvenience and headaches for me. There was a time I would have really cared about this change but considering the inconsistency of Google's products, I really can't get invested in them anymore. I try to degoogle my life as much as possible these days.