I wonder if it's really shadow detail that's missing when comparing to LCD. Being as LCD struggles with dark scenes because it can't really do black, so an image where the local dimming can't cope would the dark shadow areas show lighter than they should be? Thus when comparing oled side by side is the oled more accurate?
I think it's more the OLED having difficulty tbh. My KS still manages to go nice and black and maintain detail in not so black areas. OLED does a great in jet black but struggles with different variances and shades of black which is something the SUHD screens cope with well.