Great.
You think it's an advantage but either can't or don't want to bother to explain why. Fine.
Look, as far as we can tell, every human is self-aware, and experiences the universe subjectively. It's likely other animals do, as well, although it's hard to test - maybe impossible.
For every human to be self-aware suggests one of two things:
1. Self-awareness is itself advantageous.
2. Self-awareness is a necessary (and benign*) emergent phenomenon that arises from some other trait that is itself advantageous.
The problem is this. The first possibility lacks both empirical support and any convincing hypothetical justification. The second not only lacks the same, but may not even be testable. The entire concept of emergent phenomena is often used as a sort of mathematical God in the gaps, and this is certainly true when it comes to consciousness.
goat
* Or, if not benign, at least disadvantageous to an extent less than whatever advantage its source confers.