The keyword is "local". Non-local hidden variables is trivial (Bohm's theory) in that we just posit the particles have positions and are guided by the wave func

The keyword is "local". Non-local hidden variables is trivial (Bohm's theory) in that we just posit the particles have positions and are guided by the wave function. Hence, particle and wave properties. Simple, clean, clear, mathematically proven to agree with all results, no problem with spin and it leads to insightful derivation of identical particle behavior and even Dirac's equation. It is a bit embarrassing that the "hidden" part of the theory is particle position seeing that is what we see, after all. The wave is the more hidden part of things, gleaned only via many particle observations of similar states. Bell's inequality is theory agnostic except for demanding that experiments have results when performed. Thus, the experiments show that either reality is nonlocal or reality is not definite. Many worlds opts for the latter and it can be perfectly well-formulated (think of fuzzy videos overlaid on each other; any particular instance is not discernible, but through evolution you can distinguish which is which). Most presentations of many worlds I have seen is not understandable, but there are versions that are perfectly well-defined and fits the data. Finally, the issue why people objected to CI is not determinism, but wanting a well-defined theory. Bohm's theory and other interpretations give us that.