You’re right. Just consider your 5S as not supported.
Great. How do I downgrade to a version of iOS that runs smoothly?
Oh, of course.
Apple doesn't provide that option. So, no, I won't consider it unsupported.
Is the solution with you people just to buy a new iPhone? To reward Apple with more money for misleading you into upgrading to newer versions of iOS that suddenly slowed down your phone?
The reality is that there is no solution but to accept Apple slows down older phones. The management team say they don't do that, but of course they would say that. This is the same company that tells us they "aren't in it for the money" when it comes to Apple Music, but then we see they need to charge an extra $30 for a Magic Mouse in a different colour for some reason. And charge an extra $200 for an extra 8 GB of memory in a computer that already costs $2,000. It's all crap. It's obvious why they slow down older phones, in the same way it's obvious why they introduced Apple Music: they knew it would offset the potential decline in iTunes Music revenue, and the services segment is Apple's way to sustain its currently large quarterly revenue growths on a long-term basis as they are very much aware they are reaching a potential revenue peak with the iPhone and Mac line. Nothing to do with the crap Tim Cook likes to say.
I am very well aware my iPhone 5s is five year old technology and is far slower than even the iPhone SE (although I hope you didn't conveniently forget that Apple continued selling the 5s until Septeber 2016). However, it should not be slower than it was on the last day it was sold. And that's what Apple has rewarded us with by offering software updates that slow the device down.
I'd agree (and may still) if this proves true on the released version of iOS 12. Its pretty unfair to level this charge against Apple, though, based on pre-release versions of the software.
I should have been clear that I upgraded to iOS 12 Beta to see if Apple had addressed the performance issues in iOS 11 on the 5s, othewise I would have certainly waited until the GM before posting.
Personally, I prefer security over performance. But the point is moot in my case as I never go longer than two years on a phone.
I appreciate that, but why can't Apple offer separate security updates instead? This would address the problem entirely. They do this with older releases of macOS, no? They wouldn't need to offer newer versions of iOS on older phones that would run poorly on it. But they won't do that because then they can't brag about how unfragmented iOS is compared to Android, and yes I realise it's also to help developers target as few versions of iOS as possible.