You're right. It's not show-stopping, but it pisses me off because my iPhone is only a year old and it's already obsolete. It's kinda sad that the iPhone 5 made it through lots of updates and still performed great, but my iPhone 6 couldn't even handle the first major iOS update. Also, Apple even said themselves that iOS 9 was all about performance improvements rather than major features. They said Metal would bring smoother animations and better performance while remaining efficient at the same time. Now, I feel lied to and that makes me kind of upset.
Imagine if you brought your car to the shop because they said this "tune up" would make your car accelerate faster while also using less fuel doing it. You'd be like "Yeah! Sign me up!", but when you got your car back, you noticed that it didn't have quite as much zip as it did before. You'd feel cheated and you'd probably want your car back to the way it was.
I feel cheated that Apple lied to us about iOS 9.
Obsolete? LOL. Your iPhone 6 or anyone's iPhone 6 is nowhere near obsolete. I don't think you know why that even means.
Apple is still bringing improvements to iOS 9. You're acting like Apple is done with tweaking iOS 9.
I can't wait for iOS 10 release when the same people now will be claiming whatever is the last iOS 9 update we get is SOOOO much better than 10.0. And how great and smooth iOS 9 was and iOS 10 is the worst OS ever and they're iPhone 6s or 6s+ is obsolete.