Does Games for Windows prohibit low-level hacking for PC games? If it doesn't, requirements in 360 games mean not much for compatibility with PC. Compatibility with other Xbox versions is a more likely reason.Very possibly, although im still of the opinion the MS wants the xbox to bump up PC gaming and vice versa, afterall, both ways MS wins and Sony loses.
So I believe encouraging cross platform development and compatability is in their best interests. Hence XNA, the common controller, Live etc...
Has anyone noticed how similar the 360 and games for windows logo's are? Similar to the point were one quite seemlessly transitions into the other on adverts...