So, we are comparing a rather complex business launching to a 5 year old child? A 5 year old (assuming that it is yours) is easily kept track of and corraled. Ok, now let's try to do that with a business launch from scratch. Can all aspects be kept under complete control? Can all people and backers be forced to follow your script? Can all possible permutations of what will happen down the road (even the next day) be known? Let's see, the answers to all the above are, um, no. So if you can make your 5 year old behave all the time like you want you are a genius and should write a book. If you can control a business from scratch, start one.