I thought that recent improvements in tablets and smartphones reduced the amount of blue light emitted by the device to avoid disruption to sleep.
I don't think that blue light itself is popular with millennials, just that there have been recent developments to take some of it out of the picture displayed on certain devices. I think these "millennials" may actually be responsible for it being removed so that it doesn't fuck up their circadian rhythms, and prevent REM sleep, which would otherwise degrade their critical thinking. Just a thought strumchaser, but you might want to try it :o)