Again, Google is shuffling features around its services.
The useful Google Assistant shopping list is no longer usable on Google Keep starting today, April 10th.
It's now located within the Google Home app, which seems to be like the central for the Assistant in the future.
Just recently Google added support for different smart home devices within the former Chromecast app.
While I personally think device support belongs to the new Home app, I'm not sure about the list. I find it very convenient having that list on Google Keep.
You could easily share it, or using the widget to have it present on your phone's screen all the time.
We'll have to wait to see what's left of this convenience after the full switch.