The reason mainstream science cannot embrace the quantum nature of reality is because they desire a level of predictability that only comes from determinism.
To them, the idea that an outcome is unknowable and can be altered by free will is pure blasphemy. They don't believe in free will at all, and they don't believe your brain is anything but a deterministic biological computer locked inside your skull.
They are wrong, of course, but this is where they're coming from.