DAD does not stand for Digital recording/Analog mastering/Digital release but for Digital Audio Disc. It is an audio disc which uses the audio parameters of the DVD-video specifications and, therefore, is playable on all DVD players. AFAIK, only Chesky and Classic released such discs.
They have not flourished because of DVD-A/SACD and because the market for them is limited.
They have not flourished because of DVD-A/SACD and because the market for them is limited.