There’s a misconception that OLEDs are plateauing in brightness. This is not true at the top end of the range. The LG g4 had a huge jump in brightness, I think it was close to 50% brightness over the G3 due to MLA. The latest G5 ditched MLA and went to Tandem OLED and that’s another 50% brighter I believe. The competing QD OLED used by Samsung and others has similar brightness gains. Top of the range OLEDs are bright enough for rooms with lots of sunlight now.