Ridiculous. I love how everyone tries to make lag some kind of Apple enthusiast OCD issue.
What about PC gamers? They play games at 60 FPS. Anything below it is not acceptable. Some even notice differences in 120 FPS vs 60. If they are seasoned to see their games in 60 FPS all the time and you make it run at 30, they notice.
And they get mad.
30 FPS drops are a huge deal. I've been playing GTA 5 on PC, not even at 60 FPS. I play around 45 and when I look back at the console version that is capped at 30, it's still a HUGE difference. Input feels hugely delayed on the Xbox One version and it looks annoyingly slow even though I used to play that way before. This is because I adapted to better performance. Once you go high FPS, you don't go back.
Would it be OCD if iOS started rendering at half the resolution of the Retina display, too? That's another area where you get used to the quality and going back is extremely noticeable even though you used to deal with it in the past. Lol. So imagine if you iPhone started randomly showing jagged text and low-res images. I hope you wouldn't notice it.
That's exactly the issue with iOS 9. We've been seasoned to expect 60 FPS because that's how the 6 ran on iOS 8, the 5s ran on 7, the 5 ran on 6, the 4s ran on 5, and the 4 ran on 4. Apple's set up a pattern of good performance on the inital versions of iOS running on their flagship phone of the time. There's no excuse for drops to 30 FPS on Apple's most expensive, highest specced phone on its first version. The 6 Plus had no excuses for lagging on iOS 8 and the 6s Plus has no excuse for lagging on iOS 9. Period.
We pay for these devices. It's not like Apple can do whatever as if we owe them. They owe the user the same performance or better for a phone that costs more. The user pays for the phone and owes Apple nothing more than that.