It is not banning alone. Japan has made it ILLEGAL to offer services to modify games.
In December, Japan passed new laws that make it illegal to distribute or own game save editors or hack consoles.
www.gamespot.com
www.meti.go.jp
If they are so concerned about opening up iOS, they better stop being hypocrites about not letting people mod game saves.
Especially their law is to "prevent someone from turning a profit off a company's software or product".
If pointing out their hypocrisy is called stretching the goal post, this discussion is over.
Meanwhile, where did I say Apple has major flaws? All I said is that by opening it up, there could be potential holes that is not foreseen and could have collateral damages. (They do have zero day vulnerability as is to begin with.)
Why exactly does anyone believe opening more doors is not less secure is beyond me.