The impressive thing here is not so much the 54% adoption rate of iOS 10, as the 92% combined adoption rate of iOS 9 & 10. Yes, sure, they're pushy about it - because it's a good thing that many people would otherwise put off (like, say, voter registration). But having one of the latest two versions of the OS on nearly every device keeps them more secure, and means developers can focus on making their code work with the latest versions of the OS, rather than having to support half a dozen or more different versions, some of them quite ancient.
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That's why we should be allowed to update security fixes and still avoid silly UI changes.
Allowed? It's not a matter of permissions, the code is intertwined - what you're asking for is them to divide their resources between many more versions of the OS - redoing the same work in multiple places, and reverifying that all the changes play well with each other. I'd rather have them focus their work on the one or two newest versions of the OS, which is what they're doing with iOS 9 & 10.
Yeah, I kinda miss slide-to-unlock. Took me a couple days to stop trying it out of habit, and I ended up turning on
Settings > General > Accessibility > Home Button > Rest Finger to Open, because I'm on a 6, which doesn't have raise-to-wake and has the older/slower TouchID, so it makes opening/unlocking a little quicker. But losing slide-to-unlock is a small price to pay for getting better notifications on the main screen, the slide over to get to widgets (which I'm using more now), and the much improved Control Center - yes, it's multiple panes, but the buttons are quicker to hit, the colors are quicker to parse, and I have some Hue lights, so the Control Center access to HomeKit is a big win for me.
There are a number of places in iOS 10 where they've made text and buttons bigger, which looks less pretty, but once you get used to it, makes it faster/better to actually use. Maps and Music come to mind. Maps isn't as pretty as it was before, which made me sad, but then I used it in the car (phone in a dashboard mount for navigation) and it all became so clear - it provides useful/needed information more quickly than the old version did. I find iOS 10 to have a more pragmatic and useful interface, overall, than iOS 9. Still miss slide-to-unlock a bit.