"Not every issue an individual encounters on their device can be attributed to an iOS update. If the update itself were the root cause, then every device running that same version of iOS would exhibit the identical problem. In such a scenario, the forums would be flooded with countless posts reporting the same malfunction, creating an unmistakable wave of complaints that no one could possibly overlook. The absence of such widespread reports strongly indicates that the issue is not systemic, but rather specific to the device in question."
This isn't true. Problems can be attributable to an iOS update without affecting EVERY device running that software due to differences in hardware, environment, and other factors. If what you're saying were true, every bug would affect every device running the same system, which obviously isn't the case.