This right here. As an IT guy, as it is, I'm already not watching TV or on my phone late at night simply because it messes with the circadian rhythm. I'm one of those guys who, for the last 20 years (am 43) has slept maybe 5-6 hours a night, no matter what.
A few years back I found out about the whole blue-light thing, and got a Kindle Paperwhite, stopped using monitors/LCD screens after about 8, and holy crap - in 2 days flat I went from 5 hours a night or so to *9* hours of sleep a night, and then a solid 7.5 every night.
So there's already one reason for which I have no need or desire to be on an iDevice past about 8 or 9 p.m. As such, the lack of 'deeper blacks' is not exactly going to kill me. Yes, I may miss the OLED resolution, but I don't ever remember looking at my 4/5/6/8 and thinking "Boy this screen is crap." Even if the screen itself isn't the best....great camera, 128Gb storage, etc. I'll survive. LOL