Fact is that they can end a cargo vehicle to Space Station without a pilot.
Yes, but at what cost? Keep in mind that you've got to get the cost per mile down below the cost of a flight crew.
And forget about "cockpitless" cargo airframes. No way a clean sheet aircraft can compare in cost to a used airliner. I would submit that the cost of development would rival that of the 787. All to save the cost of a flight crew?
We can do many things. But in practice we do the cost-effective things.