For these bad open world games I feel like the developers aim to make the game to last longer and longer, not better. That's why they put in the chores to keep the players busy for 50+ hours. Why they can't fill it with interesting stuff that we actually wanted to spend hours instead is maybe because the world size is too damn big and need to have so much things in it, too much that they lose focus on what are they gonna give us from the game. Assassin's Creed is good, but I agree that it is also a good example in this case.