Probably an unpopular opinion: Darius needed a buff but damage was the worst buff he coulda got
What's the deal with Darius? Well, his weaknesses are that late game he gets kited, and he gets permastunned and he dies because he can't get any stacks off. So why buff his damage? He's already one of the most oppressive melee champs up Top. If you are a melee besides Yorick in top, you will get destroyed. Going for a single CS causes you to straight up lose a chunk of your HP and then you'll bleed out another chunk after. Even if you call for a gank he can probably 1v2 if he gets lucky. The issue with Darius isn't that he lacks damage, it's that he lacks time/survivability late game to get his might and then his damage combo. The buff he needs is survivability late game. So a health buff of any kind, an armor/magic resist buff, maybe a speed buff, or heck even some passive tenacity would help him. More damage does not help him late game and he cannot team fight because of his lack of health. A truly good Darius change would be a damage nerf and survivability buff, but we all know that is forbidden by Riot.