Jefe Bergenstein
Legend
I have answers for all these questions in my game. It's cool if you don't, but some people like coherent D&D. They call us "simulationists."
God of magic/creation says no? Perhaps the simulacrum comes from the Abadar's vault, where the god stores a copy of each thing, and thus there's only one loaner at any given time to form into a knockoff? Maybe the answer is "no one knows", because, hey, magic isn't an exact science. Its magic. There's tons of reasons why not to if that's what you want. PC's don't need access to every bit of information at all time for the world to feel coherent.
Other than George Lucas, did anyone really think introducing midichlorians improved Star Wars?