Was looking forward to night shift since it was first being reported despite the demented(?) decision to disable it in low power mode. It was the first and only thing in 9.3 that I looked for right after the update and couldn't find. Then I found the compatibility list here. I have an iPhone 5.
f.lux iOS (not allowed in store) doesn't seem to have this limitation, so I assume that Apple is still actively promoting unnecessary, wasteful, and (to many) financially foolish hardware updates with intentional but unnecessary software limitations. It's as though they're saying "Look at this cool feature.. we could make it work for you but feel that it's in our better interests if you update your phone regularly. Please don't evade our marketing decisions by jailbreaking." Reminds me of not supporting native res on the first rMBP despite having a number of scaling options, requiring a 3rd party hack or Windows in bootcamp to get the most out of the display. Who'da thought I'd need to turn to Microsoft to make Apple hardware shine. Why Apple seems to feel the need to cripple their hardware in various ways is still beyond me.
I'm not replacing a perfectly good phone for night shift, but I am annoyed. Thanks, Apple.