trust me, as weird as yellow tint sounds, its better for your eyes in the long run. blue/white light will make your eyes strain a lot it will become blatantly obvious in a matter of days. The only time i turn off the warm tint on my actual computer monitor is when i'm editing photographs and need 100% color accuracy and hence the warm tint is null at that point in time.
but for me iphones they are more of a consuming/business device to communicate and likes... not to edit photos like a pro. so its okay for me to leave True Tone on
As Bright and Stark as Apple displays are, I actually really do like the concept of true tone. I know others don’t prefer the yellowish tone, but over the course of time, especially when viewing at night, it does make less strain on your eyes. Really the Whole point of true tone is correcting the white point on the display based on the ambient lighting in the environment/room.
This year is my first time starting to use it (in the past I would just keep it off). I'm amazed at how dynamic it is in different lighting environments. When I turn it off and see the sharp blue tint, it makes me wonder if this whole time, the blueish screen is the wrong way to look at devices.