My use case for my client is that we need to copy information from the Deal level (such as Deal type) to the Line Item, to enable us to run reporting accurately. So I would like to see the functionality to copy Deal property values to their Line Items with workflow. We can copy from Line Item to Deal, but we need the reverse.
Or perhaps this could be made possible with the new ‘adanced calculation property’ feature? This is available on other objects, but not on Products right now.