I would tend to agree with this.Sorry but he's right. Never change a running system.
Keeping the iPhone on its original OS is the best way to future proof it.
Sadly as Apple does not offer any other options which doesn't slow down older devices.
Apple is always pushing you to update for security reasons or for bug fixes. Always pushing, always making it difficult not to. Make a mistake and you find yourself updated.
Then things get more complicated and the hardware slows down. Apple then denies planned obsolesence behind their claim that updates were only for security and bug fixes.
It's a useful legal excuse but people are starting to wise up.
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They won't support you if you are using a version of iOS too far outside of an arbitrary date they set.The device support is second-to-none. This is why I moved away from Android. Does the Galaxy S4 still get support?