In the "classical" imaginary Schrodinger's cat experiment, which seems to be no longer serious, or at least irrelevant, by many (some?) people, everything is explained away by decoherence.
Now, let us change the experiments and replace the classical decaying radioactive element by some variation that is isolated from the environment and thus its decoherence time is as large as we want. Same with the cat, let us replace it by a quantum computer that is computing but will be break and stop computing after the decay.
Now, everything inside the box is isolated from decoherence.
Question: Assume the box is closed. Can we still say that the quantum computer is in a pure state, in which both computing and broken are superimposed at the same time? (will a simulated cat be dead and alive at the same time?)
PD: I think what actually happens should be important, because as computer power grows, we will be able to simulate virtual beings in their environments, and unless you believe that only computers made of "meat" can have subjective experiences, the revamped cat gedanken might become relevant again