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Originally Posted by HenrikOlsen
And the whole point of Shrödinger's thought experiment was to ask how you get from the Shrödinger equation for an atom to a live or dead cat.
It didn't make any statement about the quantumness of the cat but rather asked how the quantumness of the atom gets transformed to certainty about the cat.
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I think that Schroedinger and Einstein both objected to the Copenhagen interpretation that wavefunction "collapse" was a kind of external piece of quantum mechanics, rather than something that can be internalized in quantum mechanics. The Copenhagen approach was to say that something fundamentally strange happened to quantum mechanics when you try to describe it in terms of classical apparatus, as we must always eventually do. Schroedinger and Einstein felt that this pointed to a problem in need of solving, Bohr and Heisenberg felt that anything which has no solution is not a problem worthy of consideration.
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The Copenhagen interpretation is basically a trick stating that at some point the equations become too complex for us to handle them so we handwave them away by saying they "collapse" without actually giving a mathematical description of what that collapse really is and how the collapsed state is derived from the wave function.
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Note, however, that this "trick" is a pretty good description of what physics
always does, in every case of practical interest. The goal of science is always simplification, and simplification always begins with pretense of some kind. The same holds for every published paper in physics or astronomy, so I agree with Bohr that the whole business is a tempest in a teacup.