It would make perfect sense that picky eaters would have fewer food breakthroughs. I derive a great deal of pleasure from learning to like a food that I previously disliked (usually, this involves becoming accustomed to one disagreeable flavor in the food so that I can start to notice the food’s other, very agreeable, flavors). Someone who doesn’t derive that same pleasure isn’t likely to try to desensitize themselves to that disagreeable flavor, and so they’re less likely to learn to like new foods.
I know some folks that dervie great pleasure from having new tattoos inscribed on their skin. I have a phobia of needles, and it makes me whimper even to think about obtaining a tattoo; I’ll never do it, and I’d get really annoyed at someone who kept needling me to get one done. They probably think I’m a wuss and that I’m missing out on one of life’s thrills. So be it.
Daniel