Why do I keep flashing back to the mid 70's???
..and no, it ain't the drugs, either.
Quad... SQ, QS, CD4 or discrete. Actually, the first two were the biggest parallel to the current day in that both could be incorporated cheaply onto a twwo channel product. Yes, CD4 could also but that involved a new cartridge and some pretty low cap TT wiring.
ultimately, they thrashed it out for so long and the benefits were so, well, let's be chariatible and say, "questionable" that they both eventually died of their own weight and the software manufactuter's simply didn't find it worth their while to bother with it.
But, since we're all talking the same basic 5 1/4" disc, it may take a while for them to die down unless, of course, it remains a niche, and don't be surprised if that niche costs somewhat more.