First of all the comment is more about marketing and PR then anything else:
- Make game exclusive to platform
- Comment about how game is only possible on that platform
- Fanboy war for free marketing
- Profit
Now, I'm certain there is probably some merit to what he is saying but I also wouldn't be too surprised if it was like all software engineering projects that are for one specific platform; when you have two platforms which operate in different ways (Widows/Linux, IE/Firefox, OpenGL/DirectX) and you target one specific platform you will make design decisions throughout the entire project which would make it difficult to switch to the other platform.







