I think these are valuable points, but there is perhaps an even more cynical take. Dash buttons ate into the real moneymaker: product subscriptions.
Items that had a dash button were by their nature consumables that would be needed over and over again. What's better for Amazon? A button that you may or may not remember to push or giving you a dollar off today's order in exchange for them shipping you a new container of Tide Pods [1] next month with no need to think about it?
Separately: they may have also decided that voice ordering of items (via Echo) was a better or easier play than dash buttons.
Items that had a dash button were by their nature consumables that would be needed over and over again. What's better for Amazon? A button that you may or may not remember to push or giving you a dollar off today's order in exchange for them shipping you a new container of Tide Pods [1] next month with no need to think about it?
Separately: they may have also decided that voice ordering of items (via Echo) was a better or easier play than dash buttons.
1 - https://www.amazon.com/Tide-Laundry-Detergent-Spring-Meadow/...