For a multi-store application, you would sometimes have clearly different stock locations for different stores - sometimes retail locations. Although sometimes they would be the same - warehousing for instance.

In which case do you need this exactly? Because product are already scoped by stores. And also shipping methods are scoped, so I am missing in which scenario you want an extra filtering per store. Like having a product in multiple stores but picking the stock from one stock location only?

Product is all controlled by us. Stores can only add inventory to that product. The customer effectively selects a stock item to add to their cart.

Ah got it. In this case seems like a useful thing. I’m curious to understand the impact of the change in the core, but any work in this direction is welcome.