One factor I'm not sure I'd relevant to games, is that psychoacoustic codecs are specialized for a specific sampling rate, and may have audible artifacts if the

One factor I'm not sure I'd relevant to games, is that psychoacoustic codecs are specialized for a specific sampling rate, and may have audible artifacts if the sound is repitched. Whether these artifacts are better or worse than ADPCM distorting audio (especially treble) is another question.