Celebrim
Legend
Nothing matters except whether classes are balanced with each other and that for a given level the mechanics support the story you wish to have unfold.
This means first that the designer needs to ensure that all 20th level classes share equal spotlight. If your Bloodrager is clearly superior to other classes, it fails that test.
Secondly, you need to decide what the story of 20th level characters is? Is the story of the most powerful of mortal lords, or is it the story of transcendent super-humans that have become veritable gods, capable of imposing their will on even the most puissant powers of the world? If your Bloodrager has one story, and other classes have a different one, then that fails the first test. If your intention is the former, but you've allowed the later, that fails the second test.
This means first that the designer needs to ensure that all 20th level classes share equal spotlight. If your Bloodrager is clearly superior to other classes, it fails that test.
Secondly, you need to decide what the story of 20th level characters is? Is the story of the most powerful of mortal lords, or is it the story of transcendent super-humans that have become veritable gods, capable of imposing their will on even the most puissant powers of the world? If your Bloodrager has one story, and other classes have a different one, then that fails the first test. If your intention is the former, but you've allowed the later, that fails the second test.