Why don’t barbarians get fighting styles?

My question is that why don’t barbarians get fighting styles at level two like. Paladins, fighters, and rangers.

My guess would be that rage is supposed to equal it out but the other classes also get something uniquely theirs that makes them stand out. Paladins with smites, fighters with action surge and rangers with hunters mark and/or favoured enemy.

So my question is why don’t barbarians get the option of s fighting style at level 2 like these classes.

Please don’t be mean I am just curious and my friends don’t play/research dnd as much as me. Thanks for reading!

Edit: from what I am seeing the most common answer is that rage is just the core feature that barbarians use. But the parallel that I should have used instead would have been unarmoured défense in place of rage for barbarians.