I don't have to make side by side comparisons, since I was using 8.4.1 daily on my iPhone and iPad and now I'm using iOS 9.0.1 on both.
No noticeable differences in normal use. A lot of useful features in the new iOS.
I don't give a **** at YouTube amateur videos ... On YouTube you could find an horse flying if you search deep enough.
Btw all of you keep comparing a X.0 release with the final X.4 release of the previous iOS.
Glitches could still exist at this stage.
Then you can't say its faster. Show me side by side comparison with a clean install of both iOS 8.4.1 and 9 and show me it performing faster. I'm dying to see it. There are too many variables in your "no noticeable differences in normal use". Its possible you had a dodgy iOS 8 install to base that off. The only true comparison is when you run both side by side. Sure you could be happy with the performance but that doesn't make it faster by any measure. Just means you perceive it as faster until it is properly tested.
And yes we are comparing wiht the final version of iOS 8 as it would be assumed that Apple would have performance on par with it or better given this is an update that put 'foundation' as apple calls it as one of 4 major tent poll features. Not just a casual mention.
The guardians ? Lol ...
And even that, most of the complaining are about iPhone 4S.
Ancient technology in end-2015
They are talking about the 4S, 5 and 5S. It doesn't matter how old the device is, and given the older devices barely have any new features, speed should be up to iOS 8.4.1 at least. The Guardians is a newspaper.
iPad 2 and iPad Mini 2 .... I won't even consider such an old hardware in SPEED considerations...
The iPad Mini 2 was sold as Apple's top of the Line mini (iPad Mini 3) up until a few weeks ago. It is not 'old'. It is only one generation behind Apple's flagship iPhone. And besides, given it is A7 it should benefit from the new metal enhancements.
Too many products - an interesting point, and true. Certainly true in the laptop line. rMB, MBA, cMBP, rMBP. Here's a Steve Jobs comment: one of the things he did when he came back was to pare down and rationalize the product line. Someone needs to wade into the thicket with a machete and do the same today.
There is a difference between then and now. Pre Jobs you had ridiculous numbers of computers, with different model designations and names for the same computer -a very confusing lineup (LC for education, Quadra for the high end and Performa for the consumer - such that the LC 475 for example was the same as the LC 475, the Quadra 605 and multiple variants of Performa). Very different to todays line up. The MBA, rMB, cMBP and rMBP all serve different purposes and are very different laptops. Perhaps ensuring all models receive updates, and renaming the Retina Macbook, the Macbook Air, the Macbook Air the Macbook and the cMBP the Classic Macbook would better differentiate them.
Out of pure curiosity, are the statistics on which devices are still running publicly available? I'd be interested to see the distribution among devices.
They are publicly available and will get them to you in the morning.