I appreciate that the software and updates are made "free" to me, and it may be their right to disallow "downgrades" and have time-limited windows for redemption. However, as a developer for their platform, it is quite frustrating that these restrictions are at odds with industry practice to guarantee support for older OS versions than current. I cannot purchase a new iPhone, put iOS 18 on it, install my app, and test updating the iPhone to 26. This can have very real negative consequences for the very same shared customers of mine and Apple's.