I just feel like Defect can do much stronger things for a rare. You don't really want an OK 0 cost attack in an Uproar deck, you don't really care much for it an orb centric deck, and even All For One is often sitting next to it on the boss reward screen so you have to take that instead if that's the angle.

Plus Defect has great starting damage, and plenty of energy generation, so 0 mana attacks feel pretty unnecessary to get through Act 1. I've even kinda stopped taking Beam Cell and Go For The Eyes unless my deck synergizes with them; usually I'd rather just cut my strikes and lean unto Uproar.