On the Postmates App, yes, you definitely care about where you're getting your food. The marketplace here is between eater (buyer) and restaurant (supplier).
However, if you are a business that wants to offer delivery directly and don't want to create your own delivery network, you would use Postmates API. In this case, the business (buyer) doesn't care about each individual supplier (i.e. the fleet is a commodity).
I used to manage my shops using Zapier and Google Sheets for many years. Our products were coming from many different sources and many things would fall through the cracks. Customer service would be slow since agents would have to know where orders need to be returned and the return process.
Openship started as an internal project so all this could be managed from one dashboard so we could scale to 5000+ SKUs without the system being overwhelmed. Orders can be routed to any channel that has APIs to search products and create carts.
The other benefit of Openship is that your operations are abstracted out of Shopify. If you ever want to leave Shopify or roll your own e-commerce backend, Openship and your operations won't skip a beat. Let me know if you have any other questions.
However, if you are a business that wants to offer delivery directly and don't want to create your own delivery network, you would use Postmates API. In this case, the business (buyer) doesn't care about each individual supplier (i.e. the fleet is a commodity).