You have answered your own question. The only reason to own a takedown over a one piece is to be able to take it apart into pieces or change out the limbs. If you absolutely, positively will never, ever take the bow apart or change/add limbs, buy the one piece. If you are like most people and at some point would like to, or need to, take the bow apart for whatever reason, then a takedown bow is the way to go. I agree that a good two piece bow that breaks apart at the riser is the ideal solution for someone who prefers the feel of a one piece but would like to be able to take it apart on occasion. With a two piece bow, you don't need tools, there are no loose parts to lose, and the bow feels just like a one piece when it is together. The only drawback in my mind to a two piece bow versus an otherwise identical one piece bow is the added cost. And if you only have one bow, the cost will not be very significant.
It sounds like you only need a one piece bow if everything you say is accurate and will never change. Of course, if things do change, you can always buy a different bow.
Allan