I do hope @betanalpha reconsiders and responds. I am fascinated by the fact that divergences actually get to the epistemology of Bayesian models. What does it mean for a model to be “good” or give “good” results?
In a sense, what Michael says,
and, more importantly, the first paragraph of Identity Crisis (betanalpha.github.io) is the natural preface that a user should confront on this epistemological quest.