Althouth I agree that dts is a better compression algorithm among others,
I cannot really see a point of making Bluray without any picture.
You would get better quality surround audio with SACD.
Whole point of Bluray disk would be to enjoy picture, perhaps to see a violinist playing, while enjoying good quality audio, in which aspect, Bluray excels DVD.
If you want a good audio on Bluray, you would use LPCM rather than compressed format.
Though claiming lossless, it is obvious that LPCM has better quality than lossless compression.
Again whole point of using compressed audio is to leave media space for video.
I am not saying the audio of this disk is bad.
I just struggle to make sense of it.