it wasn't cut to see for DLC, it was cut because they didn't have the time or budget for it. that's development for you. FFXV's DLC was clearly main game content sliced out and then resold. This is an EXPANSION, not a part of the main game. And everything I have seen thus far fits perfectly well in the world of FFXVI.
15 DLC's were made post main story as well. Had their own staff, different director compared to the main game,etc. They just pre planned them and left purposeful gaps in the story for them. It was dumb, but its not like they SLICED existing content from the game.