To this day, Amazon has not been able to integrate Whole Foods into the Amazon family. Their internal systems are still Whole Foods, not Amazon. That was 7.5 years ago. Here's how bad things are.
I do a search for the closest Whole Foods to where I live. I select the link to the store site. My local store shows somewhere in another state. I have to manually select my closest store and Make It My Store even though I selected the link to my closest store.
After doing all of the above, I search for a product while I'm at work. It shows available. I go home, a few miles from my work, and perform the exact same steps. The product shows out of stock. Not just on one day, but over multiple days this scenario persists.
On top of all that, the product I'm looking for is constantly out of stock (once I've verified things are working correctly).
I'm not sure what "technology and logistics expertise" Amazon was offering Saks, but if they can't get their own shit together on their own store, Saks owes them nothing.