Real-world programs (Acrobat Reader, Quake, Skype, etc) do use OSS. Today's real-world hardware does not have hardware mixer - and that means without CUSE there are no way to use these programs and keep all dekstop sound effects players and other things around. Looks like FOSS developers are slowly learn that "just use never version and/or recompile it" is not an acceptable answer to compatibility problems. I've written about it before
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