I'm currently on 9.3 beta 7 and the feature doesnt solve the problem. Even on the lowest yellow temperature which you can set, the screen is warmer than without the feature. The screen really looks colder when you turn the feature off so the screens standard calibration is not that warm at all.
And to the people telling me to wait until Apple uses oled displays: have you guys seen the Samsung Galaxy s7 yet? My iPhone's White is better than the samsungs White besides the settings chosen for the s7. The colours are exaggerated and not natural at all.
White looks creamy, grey and not saturated.
I like my current 6s+'s display way more than the s7's.
And Samsung AMOLED screen uniformity is really bad. The top is green sometimes and the bottom pink. It's very rare to find a uniform screen.