Why couldn't he do similarly for the physical/natural world?
What's the point of creating a physical/natural world where 1, 2 & 7 exist if there is another dimension in which they don't exist?
What does God get out of having these 2 dimensions of existence which have starkly different characteristics?
If you had the option to create a dimension in which 1, 2 & 7 do not exist versus the option to create a dimension in which 1, 2 & 7 do exist, which option would you chose and why?
Good questions.
First thing is about definition of God.
For my metaphysical (a branch of Philosophy) analysis I always use as definition the first premise (axiom) of the St. Anselm's ontological argument:
- God is something than which nothing greater can be thought.
AFAIK this definition of God is the most simple and elegant and I never found someone, until now, who doesn't accept it. Even Atheists must accept a definition of God in order to deny it. AFAIK this definition is accepted by every theist and atheist.
God is not a Marvel's superhero. He's bound to His very nature. From His nature comes necessary truths that are the same in all possible worlds (even in every dream of everyone) and are independent even from God's will. He can't lie and He can't be evil, for instance, because truth is greater than lie and good is greater than evil.
God using His middle knowledge or scientia media (please read about Molinism) searches all possible worlds from His nature.
Zero sum is an example of a necessary truth. Completeness and consistency is a zero sum, you must choose just one of them (the scientific method takes consistency that's why it can't be universal or complete, for instance). You can't have completeness and consistency at the same time (please read about Gödel's incompleteness).
Free-will and evil is a zero sum too.
How do we know that?
At the point God decided (using His free knowledge. See Molinism) to create free-willed beings bound (even temporarily) in a physical world He searched all possible worlds and He had to choose the best of them because it must be the greatest decision. Free-will is greater than temporary evil. So it's worth to pass through some temporary evil.
This is the best or greatest world possible in a zero sum between free-will and evil.