It certainly does make porting games easier due to the similar natures of the platform, but the infrastructure is entirely different. Consoles provide a somewhat closed environment while your traditional PC environment is more open to variety. So the optimizations that they make for each platform don't translate over to the next, and there may be other incentives to limit the platforms.
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Yea, I think that's where Mr. Cantin was coming from, obviously the game needs to be able to run on a ridiculous variety of systems in order for it to be a decent port.