Don't look at it as "not supporting an 8-year-old device" which can't get the update; look at it through the lens of "not supporting an OS which had its initial

Don't look at it as "not supporting an 8-year-old device" which can't get the update; look at it through the lens of "not supporting an OS which had its initial release just under 3 years ago and is still receiving support itself." There are plenty of reasons (of varying reasonableness) to avoid an update; people on an OS version this new shouldn't be getting this kind of harsh treatment. If you have app features that rely on a new iOS feature, you could just put those behind a feature flag. If your core API changes substantially over time meaning that out-of-date versions of your app quickly stop working without updates, it's better for the user if you use something like Swagger to auto-generate the API stubs; it makes it much easier to support your app in the long term, even for users on what would otherwise be unsupported platforms. If you're dropping support because supporting an older OS creates irreparable security issues, well, I guess in this case they might actually be ok with that.