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I find that lots of readers don't have good fine control of brightness/color temperature. The problem is not the hardware itself but not having all steps in the controls having the same apparent effect. Most every device, Eink or other, uses the same LM3630A LED driver. But this gets mapped to some OEM specific values for some OEM specific settings. I wrote my own little app with big sliders and plenty of steps. Still, it has to handle all the different software schemes of all the different devices.
Let's put it this way, I usually leave my backlight at "30%" on my scale all the time. If it's dark, I notice that, if it's bright, I don't. The power consumption at that level isn't worth worrying about.
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