There are several posts under   [quantum-interpretations] epistemic ontological,   but I'm not seeing an answer to my question there (nor from google searches)...

I hadn't thought about it very much, but I'd always thought it's simply that   mixtures are epistemic   whereas   superpositions are ontological.   So it's not really a matter of interpretation, just a matter of preparation.

But there's so much discussion about epistemic/ontological that this must be way too naive an understanding (or a complete misunderstanding). So how is it that epistemic/ontological is more foundational than just mixture/superposition? Are there any related arXiv (or other) articles?