[kgwgk]

I don't deny that QBism says things, but they don't seem so interesting to me. At least not as much as I expected when I approached the subject some time ago. I'm a fan of Jaynes and his work on information theory and statistical mechanics and I very much like the Bayesian angle here but it can be applied exactly the same (even better, I'd say) in a "realist" setting.

I think the problems in QM may not be problems after all if we could understand the physics better. Standard QM also consists in doing "as if" the quantum state represented physical reality: we (should) know that QM cannot be right and it's just an approximation to something else (QFT or whatever unification with GR) and even the way we apply QM cannot be right because it's also full of approximations (isolated systems do not exist, etc.). The "problems" that QBism "solves" may be artifacts due to those approximations and not fundamental problems. I find that all the (highly-speculative) physical theories trying to explain why things are "as if" QM was true are more promising than the metaphysical proposals of QBism or MWI (and as much as the MWI is metaphysical at least it seems better defined!).

I lack the time and patience to read the thousands of pages that Fuchs has written on the subject and I don't expect you to explain them to me either. So long, and thanks for all the fish^H^H^H^H discussion.