So why is OLED in the most expensive (actually in all...) iPhones when it's not that good? Can't possibly convince me that Mini-LED only works at 12.9" sizes and higher. Yield goes the other way around.Because mini LED is superior to OLED.
Not sure why your logic assumes OLED is better. Kuo has said OLED will be used in entry-level and mid-range iPad Air next year.