I'd love that for playing with my hubby. He just does MSQ. He doesn't play nearly as much as I do and sometimes has problems with Duty Support runs. So I end up dragging him through MSQ dungeons on the alt I play with him as a healer. It would be nice if we could pair up with a couple of NPCs just for his story. I remember when EQII added mercenaries that you and a friend could bring your mercenaries to group content to go through it together. And I think WoW's version does allow you to fill with NPCs, so it's something XIV might at least take a look into.

As a software engineer, though, I can imagine there are possibly coding constraints that make it something that would not have the sort of return on investment that management might think is worthwhile to do.