Regarding d, you CAN (theorically) build an XNA game with any tools you want. It just has to be compiled to .NET bytecode and use the microsoft APIs for access

Regarding d, you CAN (theorically) build an XNA game with any tools you want. It just has to be compiled to .NET bytecode and use the microsoft APIs for accessing system resources. Nobody is saying that apple has to give developers the ability to run native code, or to use private iPhone APIs. What they are saying is that Apple shouldn't be able to require us to use C/C++/Objective C to create the executable. That would be like Microsoft requiring XNA to be build with C#.