All-rounder.

As long as a titan of law becomes an Origin god, their loss in essence and the duration of it won't matter anymore. The path of perfection will fix their weakness. But if they die as titans of law, then none of this matters. 

This will not be the situation with Supreme Beasts though. They have no bloodline and they didn't become titans of law at all. They didn't lose any essence since they directly assimilated a seed of power. All their power is internal. Because of this, they will get no augmentation from the world. 

This is not a problem that can be fixed with life essence. There are no general solutions that can remove that weakness but there are different divine abilities that can help them gain what they lost. For example, the dragon heart. The defense of the dragon scales when activated is already comparable to that of Origin weapons.