[gsteinb88]

So I think you're confused between: (a) Experimental predictions of QM calculations (b) Interpretations of why you're performing those calculations

In particular, things like collapse of the wave-function (for example) present some difficulty for (b) -- not for (a) -- which is what QBism is trying to address. It's also why you don't get problems to solve here, and why I recommended "Quantum Mechanics as Quantum Information, Mostly". Yes, it's written casually (have a look at Fuchs' and others' publications on the arXiv that made it to scientific journals if you want fewer asides about children) but the casual nature is because this is about how we view the problems in the first place, and why we make the calculations we do, not how to carry out the specific calculations.

Consider this (example stolen from Fuchs, somewhere): We knew the correct equations of special relativity years before Einstein came along -- that's why it's called the Lorentz transform, not the Einstein transform. But Einstein's genius was to boil things down to two laws (within an inertial reference frame, typical laws of motion hold, and the speed of light is the same in all reference frames). From there we moved from simple calculations that we already knew how to do to a much deeper understanding of the subject. That's what Fuchs' and others working on interpretations of QM are trying to do -- not change the way we make calculations, but understand why the laws are the way they are in the hopes of extracting something new and different from that knowledge.