Bob: But multiple worlds are observed, in subatomic phenomena. That’s what superposition is. There is experimental evidence for multiple worlds.
Determinism is also observed, at the subatomic level.
So the alternative is: (1) It’s exactly the same at the macroscopic level (= decoherence), or else (2) Something new, with no experimental evidence, must be happening at the macroscopic level (= collapse).
Bob: But multiple worlds are observed, in subatomic phenomena. That’s what superposition is. There is experimental evidence for multiple worlds.
Determinism is also observed, at the subatomic level.
So the alternative is: (1) It’s exactly the same at the macroscopic level (= decoherence), or else (2) Something new, with no experimental evidence, must be happening at the macroscopic level (= collapse).
Not sub-atomic. Multi-atomic. Poly-atomic. Just not macroscopic.