There are multiple reasons I moved from Android to iPhone but this was by far the biggest factor that motivated me to switch. I've never had a Samsung device but I've had years upon years of numerous other Android phones and the update support for all of them has been atrocious. I got used to receiving 1 single OS update if I was lucky and maybe a few years of security updates and that was it. The few updates they did get were usually at least a year behind the Android update cycle if not more, and then they really fell behind once support stopped.

Since then I've had several iPhones that I've owned and then sold second hand and they've all had constant OS and security updates the entire time. I don't have strong feelings towards iPhones one way or another, but I can say for certain that it has never felt like my device has been abandoned.