Those Hisense tandem LCDs had some significant issues that they weren't able to iron out, they had trouble with poor response times, ghosting, and color banding

Those Hisense tandem LCDs had some significant issues that they weren't able to iron out, they had trouble with poor response times, ghosting, and color banding. Flanders Scientific also used to make tandem LCDs for ultra-high-end professional monitoring, which was a market that could tolerate high prices and poor power efficiency in the name of performance, but even they have migrated their HDR monitors over to QD-OLED now so I think the consensus is that tandem LCD is a dead end.