Earlier quoted context omitted.
> Apple's business model heavily relies on planned obsolescence to bully you into throwing away YOUR working iPhone when they've decided its time for you to drop another 700-1000$ by making their latest OS so slow that your phone is essentially unusable. Ah. That’ll explain why the 5s - a phone that was released 5 years ago - is still supported with iOS 12.
Supported? Yes. Usable and not excruciatingly slow? Not so sure.
I am. My partner uses it as her daily driver everyday. I have asked her if she wants to upgrade, but she doesn't see the point as there is nothing wrong with the 5s, which is running the latest release of iOS11.