OLED is NOT brighter than LCD with mini LED backlighting. No OLED TV has a full screen brightness of 1,000 nits, which is ideally what you would want for perfect HDR. You do NOT need 1,000 nits full screen, but that is what most movies are mastered in. It does also not mean that the movie is at 1,000 nits the entire time, it probably more like less then 1% of the time in a small 10-25% window, like an explosion. The Apple iPad Pro tandem display can produce 1,000 nits full screen with OLED. The best OLED TVs have been getting around 200 nits full screen and around 800 in a 10% window (this is still bright enough to enjoy any film). But it's not what the specs of HDR are supposed to be, an HDR TVs should be able to hit 1,000 nits at least in a 10% window. There are OLED TVs that can do 300-400 nits in full screen and well over 1k nits in 10% window, like the LG G5 or the Samsung S95F which can do over 400 nits full screen. Sounds great and it is, but we are still 600 nits away from 1k nits full screen on a TV. That will be the one to get when it eventually comes out. Here's the thing about brightness, our eyes perceive changes in brightness logirithmically, however, brightness changes in a linear manner. So doubling the brightness from 200 nits to 400 nits does double the brightness. However, the perceived brightness it only appears a small amount brighter (something like 10-20% brighter). So it really only matters what our "perceived brightness" as we literally cant see it any other way. Apple is probably struggling with the same issues the TV companies have been having. If you increase the brightness on an OLED panel, you create burnin quicker, it gets hot, and because OLED is Organic, the Red, blue and green will age differently. This is a fundamental problem with oled. That doesn't mean an oled tv wont last 10 years or so, they have and will continue to do so as the tech continues to evolve. But remember the pixels are constantly losing brightness over time where LED backlighting does not.