My question is not about the nature or reality of quantum superposition, superposition is a fact and no argue about that.

My question is: What is the purpose of superposition and why does the universe need it?

Every law of physics has its necessity, and makes perfect sense that the universe cannot work without it. But when thinking about superposition, it seems physics laws will work fine with or without superposition!

Edit: I am not questioning superposition itself, but the wisdom behind it. Imagine a world without superposition, where every state is determined from initial conditions, physics laws will work just fine!