Why Quantum Mechanics?

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In light of his own mortality and the realization that he already hit 40 recently, Scott wants to know

"Q: Why should the universe have been quantum-mechanical?

If you want, you can divide Q into two subquestions:

Q1: Why didn’t God just make the universe classical and be done with it? What would’ve been wrong with that choice?

Q2: Assuming classical physics wasn’t good enough for whatever reason, why this specific alternative? Why the complex-valued amplitudes? Why unitary transformations? Why the Born rule? Why the tensor product?"

https://scottaaronson.blog/?p=6244

As anticipated, a large discussion has been sparked commonly touching upon platonism in the form of possible world semantics and mathematical universe hypothesis. What does 4Chan think?