To get people sucked in continuously, they have to keep adding new reasons for audibly better sound quality. They can only come up with new, but not always (though may be sometimes, obviously) real reasons because there are usually none.., and not needed, because those things are already transparent enough for most humans. R2R, MQA, BluOS, DragonFry dacs, HDAMs, Class A, high current, toroidal, elliptical, sand cast tranformer, autoformer, expensive interconnects, fully/truly balanced, high DF>1000, DDG (one of NAD's new one) etc.etc..... the list is endless, yet there are always suckers in audio ready, waiting and rushing to suck things in!