So thanks to reader JMH for this one. "Why do people like to eat things stuffed with other things?" Right you are, JMH, to ask this question! I had to look at this a couple different ways.
1. Sometimes you need the outer part more to hold in the goodies. I call this the "goodies" theory. Examples include a souvlaki sandwich, a gyro, a stuffed pepper (arguably), a jelly-donut, a "calzone," or any other treatment where the "stuff" is "held in" by some outer item that keeps it from scattering, falling apart, or rolling around. This could be during cooking, during eating, or both. In the case of mushrooms that have been stuffed with various diced and spiced materials - delicious! Have you had these? They're easy to make and easy to eat!
2. Deviled eggs are another example. When you think it through, the white part of the hard-cooked egg itself is not very flavorful. Yet would you want to eat just spoonfuls of the filling? No, not really. Here, the contrast of the two different tastes and textures eaten together is a key to deliciousness. This I call my second theory, or "theory number 2" for lack of a more technical term. This principle comes into play any time you might have something like an olive (for instance) - which people do eat on their own! - but you stuff it with bleu cheese, or an almond, or roast garlic to add interest: "Hey! There's a little guy in here!"
Needless to say, both of these principles are often in operation at the same time. A third theory:
3. What if the outer part is just as delicious as the inner part? So that you end up with something glorious stuffed inside of something just as glorious? Can anybody think of an example? It feels like this should be the holy grail approach for all stuffed-food techniques, yet how often is it even tried?
Thanks for your question, JMH! You know what? This is one question I suspect has as many answers as there are things being stuffed into things - or people stuffing their faces with the results!