I have read Deutsch’s book as well — awesome read.

The problem I have with claims like “there is no such process going on”, is we … don’t know. And the model of conjecture is a theory, also hard to prove — and thus my main (admittedly petty) point is that confidence about similarity or dissimilarity are both unfounded.

It’s like we are comparing the insides of two black boxes and trying to make absolute claims on them.