OLED already has infinite contrast ratio, so that can’t be increased. And the iPhone 14 Pro has a maximum brightness of 2000 nits, which is plenty for me. Burn in for phones tends to be rare and/or minor. I’m interested in advances in display technology, but OLED seems optimal in just about every way, except for burn in.
I’m most interested in microLED for laptops and desktop monitors, where burn-in is the most likely to happen.
Less power consumption is good, but not exactly an exciting feature in a display, though the small bump in battery life will be beneficial.