“Taste for variety” [...] could lead to a surprising amount of convergence among the things they end up optimizing for
Wouldn’t this be tautologically untrue? Speaking as a variety-preferrer, I’d rather my values not converge with all the other agents going around preferring varieties. It’d be boring! I’d rather have the meta-variety where we don’t all prefer the same distribution of things.
Might not be what you’re thinking of, but the first thing that comes to mind for me is misophonia: a basically-neutral or maybe mildly-irritating object experience, which somehow gets blown completely out of proportion in the mind and becomes a big problem. Developing an “I’m really bothered by this particular sound” narrative makes it worse, of course.
Alas, I have no idea how to uncondition that particular narrative irritant once it’s in there. If there’s any technique of ‘shaping the narrative’ strongly enough to override this, I’ve never heard of one, and knowing about it to the point where I’m able to successfully practice it would be huge.