It connects the apps that move physical goods: Purchase, Inventory, Manufacturing, Quality, Maintenance and the Sales and Accounting hand-offs on either side. Done properly you get one stock figure, one cost, traceability from receipt to dispatch, and replenishment that reacts to real demand. Done as separate app rollouts you get three sources of truth and manual reconciliation.
Most of the difficulty is not in the apps. It's in the decisions underneath them: how a unit of measure behaves when you buy in kilos and sell in packs, whether a lot is tracked at receipt or at production, which warehouse owns stock in transit, when a cost is standard and when it's real. Those decisions are cheap to make at design time and expensive to change after go-live.
We've built this on both editions, from a foundry running ten-plus casting stages on Community to a food manufacturer with batch traceability and a Shopify storefront on Enterprise. The sections below follow the goods, not the app list.