I'm not going to lie, the idea of a job class system in XVI, while highly unlikely, would be neat.
As for Agni's Philosophy, that was simply a tech demo for the Luminous engine, it was never meant to be a game. Same deal with the Prototype demo they released two years ago.
Both this and Agni's Philosophy were simply meant to show off the tech and expertise of the staff to investors. Interestingly enough. A lot of elements from Agni's Philosophy made it into FFXV when you think about it. Fantasy in reality and all that.