Both features were used as selling points in the early days of Ambisonics, and especially Ambisonic mixing. They helped to overcome a "chicken and egg" situation where record companies were reluctant to release Ambisonic recordings because there were few decoders in the marketplace, while hi-fi manufacturers were unwilling to license and incorporate Ambisonic UHJ decoders in their equipment because there was not very much mainstream released content. On the one hand, it was worth having a decoder because you could get more out of your existing (stereo) record collection; while on the other it was worth making UHJ recordings because even people without a decoder