I've never understood the brightness issue. If you run an OLED TV or phone at full brightness, your eyes must be shot to pieces. It's painful as hell and it cannot be healthy...
TVs are not lamps. You don't run the entire TV at full blast, with a full screen of white.
And even if you had a predominantly white scene, a brighter TV can be of benefit particularly when in a room with a lot of ambient light. Plus, more brightness allows you to better differentiate different shades of white. eg. Snow covered mountains in the clouds.
To give you an idea of various brightness levels, if you're outside, a flower in partial shade might be 500 nits, whereas a metal object in the sun would be several thousand nits even on a partially cloudy day.
Typical recent OLED TVs max out around 700 nits, although they do go a bit higher these days in the higher end models.
LCDs can reach a couple of thousand nits for the higher end models, but the problem is their black levels often suffer. The point of mini-LED is to improve the black levels, while maintaining the brights, for overall good HDR.
In general though for content consumption, I prefer perfect blacks to ultra bright whites.
All professional graphic monitors are LCD. Most reference monitors used in video production including the $30k ones are LCD.
Well I see you said "most". However, you conveniently left out that Sony sells several professional OLEDs for broadcast video editing. In fact, for years, OLED was their top-of-the-line. Now it's not, but it's still up there of course. I believe their professional OLEDs go up to around $28000.
But they’re not black, that’s my point. Most of the apps - like this website - are dark gray *not* black so there is no savings.
If you watch a properly mastered video on an OLED phone, black is black. The first time I watched a proper video on my OLED TV, at the transition from the intro to the actual show, I thought my TV had turned off. It was pitch black. It turns out the show had been mastered properly, so the transition was pitch black, which OLED faithfully showed.
Many apps don't have proper blacks, but I generally interact with my iPad with various applications with ambient light in the background so that's OK. The only time I might not is when I'm watching video, and that context I really like to have my perfect blacks. That's one of the main reasons I want to eventually upgrade from my 10.5" iPad Pro. However, I don't really need to spend twice as much on an iPad Pro if an iPad Air gets OLED in 2022. I am not going to be creating professional multimedia content on that thing.