The limitations of a 192 kb/s Dolby Digital track as compared to the LPCM stereo track are pretty apparent to me whenever I hear the music. It is true that how important this will be is up to the tastes of the individual. In my case, the music is one of the main things I watch Star Wars for, so it is very important.
But objectively speaking, it is a fact that the LPCM track is of better quality than the lossy version derived from it.