*there is no useful innovation to be had anymore in the retail space"
I don't know if you can really call it innovation, but I imagine the staff shopper is coming back. You walk up to the clerk and give them your order (or submit online ahead of time). The clerk or shopper loads your bags from the stock room.
This solves several problems in retail that have become very difficult for store owners to deal with. It gets rid of customer theft almost entirely. If moves some of the value add of middlemen, like Door Dash, into the store's revenue stream. It provides upsell opportunities and staff engagement. It allows for more efficient stocking and inventory management for cheap. It addresses customers like the elderly who get overwhelmed by modern consumer choice.
There are downsides. But I think something like this happening more frequently (like the old Service Merchandise store that predated Best Buy) is likely.