What is it about pie

What is it about pie that makes it perfect? My theory is the contrast of textures.  Buttery flaky crust gives way to an oozy sugary sweet filling with chunks of fruit or a velvety custard or eggy chess.  It is that complementarity (or contradiction) that sets up the feeling of expectation and desire that brings us back to pie, whether hot, cold, stale, fresh, or in between.  Essentially, stratification makes for the tension of the pie plot, a textural contrast that bits of crust will clean away the food particles of filling as it washes around your mouth and in between your teeth.