i'd love a 'slow amazon' variant where i could shop for things as normal throughout the week, but it would hold them all until a single specified time where i could do a final review/approval of orders for the whole household the order and then have it submitted at once.

I'd win because I could remove the late-night impulse buys and de-duplicated things added by multiple family members.

They win because it simplifies shipping logistics/packaging and actually encourages more loose/impulse driven buying ("just add it to the cart, we'll review it later").