It's WAY too early to complain about the size of the royal pack. We haven't seen the Regalia Replica, the data/lore scattered all around the world, Omega weapon, all the quest's with the boat, etc.
We haven't even seen the cutscene where Cor helps you fight Cerberus. Thus far we've only seen the version without Cor's help from people's playthroughs. And that means that there's probably more quests to do to get Cor in that fight with you.
After all of that is revealed, if it still feels too small, that's fine. I think we should hold back until then, though.