For me it’s certainly to do with the sunk cost fallacy. I’ve been buying apps for the iPhone for years, and while I don’t use 99% of them regularly any more, I like to still (mostly) have the option.
If I jump ship, I’m casting all of those apps aside.
Add to that the fact that my iPhone 6S is paid off, and it makes it even harder to switch until this phone craps out.
But I would be lying if I said I don’t think about it. Nothing about the latest generation of iPhones (apart from the camera) appeals to me.
I enjoyed getting Seamus’ opinion.