The way I see it, the J/P is an inward thought system of what we believe of how we should live our lives. Perceiver types enjoy living life not know where its going, leaving things up to chance, whether its their career, relationships, or hobbies. They shy away from commitment, not because of being phobic against it or anything, but because they believe life is too complex to just stick to one thing forever and that sometimes, certain things has to end and that's okay. They have a "live and let live" mindset. In a way, life is an adventure for them, whether they are an extravert or an introvert, thinker or feeler, and so on.
Judging types believe in eternity, and they find comfort in the sameness of life. They are not boring people, but they just don't see the point of always being spontaneous and changing things when they're happy and comfortable with something or somebody. That doesn't mean that they'll change something if it is causing pain or stunting personal growth, but at the same time, for many things in life, if all is going well, why change? They welcome commitment, whether it is for a cause they believe in, or a person they love enough to marry for life, and they enjoy closure above all else. It has nothing to do with being organized or punctual or clean as a whistle, but personal beliefs.
I might be wrong. I might be talking out of my ass. But this is how I see the J/P dilemma.