Pro:
- Make exe smaller 
- One less SDK for developers to download and install 
- Native support only by a few sound cards (I know of Creative and NVIDIA) 
- Windows SDK maintained by Creative Tech. 
- Official documentation too lean 
- XAudio2 works as well 
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Contra:
- Less diversity 
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I would still keep the source file in the SVN repo so some Linux guy can modify it a little and use it for the Linux build if he wishes, but I think it would be a good idea to remove it from the windows build.
