There's something really soothing about having a new spherical friend who only requires a little misting now and again.
Let's face it, once you cut into a pie it's just a mess. It's much easier to maintain the aesthetics of a pie if each person has their own.
Call it a cake in a jar, call it a jark, I honestly couldn't care less what you call it, just get me a spoon and get out of my way!